SWDEV-481860 - Match malloc/hipMalloc calls with free/hipFree calls in all samples.

Change-Id: Ib44551b3f60cd90fa7158e4ed016ef5549a34ef7

samples/0_Intro/square/square.hipref.cpp

@@ -92,5 +92,11 @@ int main(int argc, char* argv[]) {
             CHECK(hipErrorUnknown);
         }
     }
+
+    CHECK(hipFree(A_d));
+    CHECK(hipFree(C_d));
+    free(A_h);
+    free(C_h);
+
     printf("PASSED!\n");
 }