[PATCH, C] Warn ordered comparison pointer with null pointer constant

[Shujing Zhao]

Hi,
As Manuel's reply at http://gcc.gnu.org/ml/gcc-patches/2010-04/msg01425.html, 
this patch is to change the warning of (z >= (void *)0) as same as the warning 
of (z >= 0), if z is a pointer.

Tested on i686-pc-linux-gnu.
Is it ok for trunk?

Thanks
Pearly


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