spatch for trivial pointer comparison style?

[Joe Perches]

I added a checkpatch entry for this.
Maybe some cocci test like this would be useful?

@@
type t;
t *p;
@@
-	p == NULL
+	!p

@@
type t;
t *p;
@@
-	p != NULL
+	p

@@
type t;
t *p;
@@
-	NULL == p
+	!p

@@
type t;
t *p;
@@
-	NULL != p
+	p


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