Add tests for valid NULL in gcm_free()

tests/suites/test_suite_gcm.function

@@ -263,6 +263,15 @@ exit:
 }
 /* END_CASE */
 
+/* BEGIN_CASE */
+void gcm_valid_param( )
+{
+    TEST_VALID_PARAM( mbedtls_gcm_free( NULL ) );
+exit:
+    return;
+}
+/* END_CASE */
+
 /* BEGIN_CASE depends_on:MBEDTLS_SELF_TEST */
 void gcm_selftest(  )
 {

tests/suites/test_suite_gcm.misc.data

@@ -1,2 +1,5 @@
 GCM - Invalid parameters
 gcm_invalid_param:
+
+GCM - Valid parameters
+gcm_valid_param: