Merge pull request #2710 from k-stachowiak/unified-exit-in-examples-2.16

Backport 2.16: Unify the example programs' termination

programs/test/selftest.c

@@ -500,7 +500,5 @@ int main( int argc, char *argv[] )
     if( suites_failed > 0)
         mbedtls_exit( MBEDTLS_EXIT_FAILURE );
 
-    /* return() is here to prevent compiler warnings */
-    return( MBEDTLS_EXIT_SUCCESS );
+    mbedtls_exit( MBEDTLS_EXIT_SUCCESS );
 }
-