dereference: find more cross function dereferences

dereference: find more cross function dereferences

Quite often there is code like:

	struct whatever *p = &param->foo;

	p->x = 100;

The &param->foo is not a dereference.  The p->x is a dereference, but it
didn't result in anything being recorded in the database.  What this code
does is that when we see the "p->x", then record the "param" was
dereferenced.

Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>