xserver: Cleaning up memory allocation functions and macros

[Daniel Stone]

On Mon, Apr 30, 2007 at 01:18:47PM -0700, Alan Coopersmith wrote:
> Egbert Eich wrote:
> > >   - free() can take NULL as argument, so it's not needed to test for 
> > NULL > before calling it.
> >
> >Maybe not on all implementations? If we use a wrapper or macro this
> >can be handled there. The default wrapper doesn't need to address this.
> 
> Digging out my ancient copy of the Annotated ANSI C Standard (C89), it 
> requires
> free(NULL) to be safe - "If ptr is a null pointer, no action occurs."

Likewise, the standard specifies realloc() to malloc() on NULL.
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