Add cleanup code in module api samples

samples/0_Intro/module_api_global/runKernel.cpp

@@ -145,6 +145,10 @@ int main() {
         };
     }
 
+    hipFree(Ad);
+    hipFree(Bd);
+    delete A;
+    delete B;
     hipCtxDestroy(context);
     return 0;
 }