Rename the _ret() functions

Signed-off-by: TRodziewicz <tomasz.rodziewicz@mobica.com>
diff --git a/programs/hash/hello.c b/programs/hash/hello.c
index 70bea42..18beb69 100644
--- a/programs/hash/hello.c
+++ b/programs/hash/hello.c
@@ -55,7 +55,7 @@
 
     mbedtls_printf( "\n  MD5('%s') = ", str );
 
-    if( ( ret = mbedtls_md5_ret( (unsigned char *) str, 13, digest ) ) != 0 )
+    if( ( ret = mbedtls_md5( (unsigned char *) str, 13, digest ) ) != 0 )
         mbedtls_exit( MBEDTLS_EXIT_FAILURE );
 
     for( i = 0; i < 16; i++ )