Disable strerror in test programs

This commit disables printing strerror messages in test programs. This
is due to moving the functions back to Mbed TLS and wanting to keep
dependencies of programs small. The code has not been removed but simply
commented out for when these functions are reimplemented.

Signed-off-by: Harry Ramsey <harry.ramsey@arm.com>
diff --git a/programs/pkey/gen_key.c b/programs/pkey/gen_key.c
index 83d7b71..da7d262 100644
--- a/programs/pkey/gen_key.c
+++ b/programs/pkey/gen_key.c
@@ -453,8 +453,9 @@
 
     if (exit_code != MBEDTLS_EXIT_SUCCESS) {
 #ifdef MBEDTLS_ERROR_C
-        mbedtls_strerror(ret, buf, sizeof(buf));
-        mbedtls_printf(" - %s\n", buf);
+        mbedtls_printf("Error code: %d", ret);
+        /* mbedtls_strerror(ret, buf, sizeof(buf));
+           mbedtls_printf(" - %s\n", buf); */
 #else
         mbedtls_printf("\n");
 #endif
diff --git a/programs/pkey/key_app.c b/programs/pkey/key_app.c
index e3a6966..5ccb063 100644
--- a/programs/pkey/key_app.c
+++ b/programs/pkey/key_app.c
@@ -347,8 +347,9 @@
 
 #if defined(MBEDTLS_ERROR_C)
     if (exit_code != MBEDTLS_EXIT_SUCCESS) {
-        mbedtls_strerror(ret, buf, sizeof(buf));
-        mbedtls_printf("  !  Last error was: %s\n", buf);
+        mbedtls_printf("Error code: %d", ret);
+        /* mbedtls_strerror(ret, buf, sizeof(buf));
+           mbedtls_printf("  !  Last error was: %s\n", buf); */
     }
 #endif
 
diff --git a/programs/pkey/key_app_writer.c b/programs/pkey/key_app_writer.c
index 60f992e..a460b18 100644
--- a/programs/pkey/key_app_writer.c
+++ b/programs/pkey/key_app_writer.c
@@ -469,8 +469,9 @@
 
     if (exit_code != MBEDTLS_EXIT_SUCCESS) {
 #ifdef MBEDTLS_ERROR_C
-        mbedtls_strerror(ret, buf, sizeof(buf));
-        mbedtls_printf(" - %s\n", buf);
+        mbedtls_printf("Error code: %d", ret);
+        /* mbedtls_strerror(ret, buf, sizeof(buf));
+           mbedtls_printf(" - %s\n", buf); */
 #else
         mbedtls_printf("\n");
 #endif
diff --git a/programs/pkey/pk_decrypt.c b/programs/pkey/pk_decrypt.c
index b8f7943..025f69c 100644
--- a/programs/pkey/pk_decrypt.c
+++ b/programs/pkey/pk_decrypt.c
@@ -142,8 +142,9 @@
 
 #if defined(MBEDTLS_ERROR_C)
     if (exit_code != MBEDTLS_EXIT_SUCCESS) {
-        mbedtls_strerror(ret, (char *) buf, sizeof(buf));
-        mbedtls_printf("  !  Last error was: %s\n", buf);
+        mbedtls_printf("Error code: %d", ret);
+        /* mbedtls_strerror(ret, (char *) buf, sizeof(buf));
+           mbedtls_printf("  !  Last error was: %s\n", buf); */
     }
 #endif
 
diff --git a/programs/pkey/pk_encrypt.c b/programs/pkey/pk_encrypt.c
index a916bc6..9ada67d 100644
--- a/programs/pkey/pk_encrypt.c
+++ b/programs/pkey/pk_encrypt.c
@@ -143,8 +143,9 @@
 
 #if defined(MBEDTLS_ERROR_C)
     if (exit_code != MBEDTLS_EXIT_SUCCESS) {
-        mbedtls_strerror(ret, (char *) buf, sizeof(buf));
-        mbedtls_printf("  !  Last error was: %s\n", buf);
+        mbedtls_printf("Error code: %d", ret);
+        /* mbedtls_strerror(ret, (char *) buf, sizeof(buf));
+           mbedtls_printf("  !  Last error was: %s\n", buf); */
     }
 #endif
 
diff --git a/programs/pkey/pk_sign.c b/programs/pkey/pk_sign.c
index d48911c..b8f06c4 100644
--- a/programs/pkey/pk_sign.c
+++ b/programs/pkey/pk_sign.c
@@ -143,8 +143,9 @@
 
 #if defined(MBEDTLS_ERROR_C)
     if (exit_code != MBEDTLS_EXIT_SUCCESS) {
-        mbedtls_strerror(ret, (char *) buf, sizeof(buf));
-        mbedtls_printf("  !  Last error was: %s\n", buf);
+        mbedtls_printf("Error code: %d", ret);
+        /* mbedtls_strerror(ret, (char *) buf, sizeof(buf));
+           mbedtls_printf("  !  Last error was: %s\n", buf); */
     }
 #endif
 
diff --git a/programs/pkey/pk_verify.c b/programs/pkey/pk_verify.c
index b4e84c3..063abd7 100644
--- a/programs/pkey/pk_verify.c
+++ b/programs/pkey/pk_verify.c
@@ -117,8 +117,9 @@
 
 #if defined(MBEDTLS_ERROR_C)
     if (exit_code != MBEDTLS_EXIT_SUCCESS) {
-        mbedtls_strerror(ret, (char *) buf, sizeof(buf));
-        mbedtls_printf("  !  Last error was: %s\n", buf);
+        mbedtls_printf("Error code: %d", ret);
+        /* mbedtls_strerror(ret, (char *) buf, sizeof(buf));
+           mbedtls_printf("  !  Last error was: %s\n", buf); */
     }
 #endif
 
diff --git a/programs/test/benchmark.c b/programs/test/benchmark.c
index 93c1729..36ac022 100644
--- a/programs/test/benchmark.c
+++ b/programs/test/benchmark.c
@@ -117,8 +117,9 @@
 
 #if defined(MBEDTLS_ERROR_C)
 #define PRINT_ERROR                                                     \
-    mbedtls_strerror(ret, (char *) tmp, sizeof(tmp));          \
-    mbedtls_printf("FAILED: %s\n", tmp);
+    mbedtls_printf("Error code: %d", ret);
+/* mbedtls_strerror(ret, (char *) tmp, sizeof(tmp));          \
+   mbedtls_printf("FAILED: %s\n", tmp); */
 #else
 #define PRINT_ERROR                                                     \
     mbedtls_printf("FAILED: -0x%04x\n", (unsigned int) -ret);