[PATCH] libdrm compile warnings fixes

[Matthew W. S. B. <ma...@be...>]

Hi,

I've fixed up some compile warnings in the attached patch; I think a
couple of cases may actually have been bugs. One case I have not touched
is converting between void * (64 bit here) and drm_handle_t (32 bit
here), as I don't understand the issues here; it would be nice if no
warnings were emitted if it is safe.

Additionally, the function libdrm/xf86drmSL.c:drmSLLookupNeighbors()
appears to be completely broken as it computes on the variable update
which is unconditionally undefined.

Matthew W.S. Bell