sha: fix minor issues/typos

Signed-off-by: Valerio Setti <vsetti@baylibre.com>
diff --git a/include/mbedtls/sha256.h b/include/mbedtls/sha256.h
index 979ad29..3d3e3fc 100644
--- a/include/mbedtls/sha256.h
+++ b/include/mbedtls/sha256.h
@@ -178,6 +178,7 @@
 
 #if defined(MBEDTLS_SELF_TEST)
 
+#if defined(MBEDTLS_SHA224_C)
 /**
  * \brief          The SHA-224 checkup routine.
  *
@@ -185,7 +186,9 @@
  * \return         \c 1 on failure.
  */
 int mbedtls_sha224_self_test( int verbose );
+#endif /* MBEDTLS_SHA224_C */
 
+#if defined(MBEDTLS_SHA256_C)
 /**
  * \brief          The SHA-256 checkup routine.
  *
@@ -193,6 +196,7 @@
  * \return         \c 1 on failure.
  */
 int mbedtls_sha256_self_test( int verbose );
+#endif /* MBEDTLS_SHA256_C */
 
 #endif /* MBEDTLS_SELF_TEST */
 
diff --git a/include/mbedtls/sha512.h b/include/mbedtls/sha512.h
index 545c81c..eb5cef5 100644
--- a/include/mbedtls/sha512.h
+++ b/include/mbedtls/sha512.h
@@ -195,6 +195,7 @@
 
 #if defined(MBEDTLS_SELF_TEST)
 
+#if defined(MBEDTLS_SHA384_C)
  /**
  * \brief          The SHA-384 checkup routine.
  *
@@ -202,7 +203,9 @@
  * \return         \c 1 on failure.
  */
 int mbedtls_sha384_self_test( int verbose );
+#endif /* MBEDTLS_SHA384_C */
 
+#if defined(MBEDTLS_SHA512_C)
  /**
  * \brief          The SHA-512 checkup routine.
  *
@@ -210,6 +213,8 @@
  * \return         \c 1 on failure.
  */
 int mbedtls_sha512_self_test( int verbose );
+#endif /* MBEDTLS_SHA512_C */
+
 #endif /* MBEDTLS_SELF_TEST */
 
 #ifdef __cplusplus