changing definition of NULL to ((void *)0) for C

[Sascha Wildner]

Nicolas Thery wrote:
That looks like a good thing to me.  You must have spent quite some
time making all these changes!
I reviewed the 1st half only.  I've got only a pedantic remark.  NULL
should be changed to 0 in the following diff :-)
Yeah,

Constantine Murenin also remarked that in a private mail to me. I'll 
check it out tonite and add it to the patch.

Sascha

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