patch for warning on logical negation with known result

[jahanian]

Minor change. I should not bail out early when types of implicit cast and its sub expression are identical as
implicit cast may be for lvalue to rvalue conversion. This showed up for this test case (with old patch warning is not being issued).

__attribute__((__nonnull__))
void test1(void *nonnull) {
   if (nonnull) {}
}


- Fariborz

> On Oct 24, 2014, at 1:23 PM, jahanian <fjahanian at apple.com> wrote:
> 
> Thanks for the review. Here is the updated patch.
> 
> 	
> <nonnull-patch.txt>
> 
> - Fariborz
> 

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