dereference: don't talk about dereferencing arrays (only pointers)

dereference: don't talk about dereferencing arrays (only pointers)

If you have:

	char array[10];
	char *p = &array[0];

Then you can do array[0] or p[0] and it's the same.  But in terms of
static analysis and tracking dereferences only the pointer dereference is
interesting.

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