C99 "compound literals are not allowed" is shown sometimes

* Operating System : Linux Ubuntu
* VS Code version 1.18.1
* C/C++ extension version 0.14.3

Sampel code:
```
struct Foo {
	int a,b;
};

void foo(struct Foo* f) {
	//struct Foo f = {.a = 1};
	foo(&(struct Foo){.a=1});
        /* Sometimes " a compound literal of type "struct Foo" is not allowed" is shown */
}
```