[Intel-gfx] uxa_prepare_access can fail

[Keith Packard]

Running UXA overnight, I had the kernel fail to map a new pixmap (that's
a separate issue, of course). However, nothing up the call stack checks
this failure, and so the X server happily attempts to dereference NULL.

I've patched libdrm/intel (to actually return the kernel error) and then
patched uxa to check for the error.

-- 
keith.packard at intel.com
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