Fix bugs in example programs: change argc == 0 to argc < 2

Signed-off-by: Aditya Deshpande <aditya.deshpande@arm.com>
diff --git a/programs/ssl/ssl_client2.c b/programs/ssl/ssl_client2.c
index d42a38e..ca74c00 100644
--- a/programs/ssl/ssl_client2.c
+++ b/programs/ssl/ssl_client2.c
@@ -767,7 +767,7 @@
     mbedtls_test_enable_insecure_external_rng();
 #endif  /* MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG */
 
-    if (argc == 0) {
+    if (argc < 2) {
 usage:
         if (ret == 0) {
             ret = 1;
diff --git a/programs/ssl/ssl_mail_client.c b/programs/ssl/ssl_mail_client.c
index 643d3c2..6f1dc1c 100644
--- a/programs/ssl/ssl_mail_client.c
+++ b/programs/ssl/ssl_mail_client.c
@@ -367,7 +367,7 @@
     mbedtls_pk_init(&pkey);
     mbedtls_ctr_drbg_init(&ctr_drbg);
 
-    if (argc == 0) {
+    if (argc < 2) {
 usage:
         mbedtls_printf(USAGE);
 
diff --git a/programs/ssl/ssl_server2.c b/programs/ssl/ssl_server2.c
index dd78c0b..fb66b4c 100644
--- a/programs/ssl/ssl_server2.c
+++ b/programs/ssl/ssl_server2.c
@@ -1449,7 +1449,7 @@
     signal(SIGINT, term_handler);
 #endif
 
-    if (argc == 0) {
+    if (argc < 2) {
 usage:
         if (ret == 0) {
             ret = 1;