[cfe-commits] [Patch] Remove false positives from warnings on NULL in arithmetic expressions.

[Richard Trieu]

-Wnull-arithmetic was catching some false positives.  Switch the checking
code so that it will warn on specific types instead of not warning on
specific types.  Now, comparisons between non-boolean arithmetic types and
NULL will give this warning.  New types to warn on can be added later if
needed.
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