Bug path

test_1a

‘test_1a’: events 1-2

23	void *p = NULL;
	^
	\|
	(1) ‘p’ is NULL
24	foo(p, q, r); /* { dg-warning "use of NULL 'p' where non-null expected" "warning" } */
	~~~~~~~~~~~~
	\|
	(2) argument 1 (‘p’) NULL where non-null expected