drm/i915/selftests: Report ENOMEM clearly for an allocation failure
If we can not run the drunk_hole test because we couldn't allocate the memory for the permutation array (even after we tried trimming the size), report a clear ENOMEM. Similary, if we are asked to operate on a hole too small for ourselves, make it skip quietly. v2: Avoid malloc(0) since that returns ZERO_SIZE_PTR not NULL. v3: Fixup similar construction for lowlevel_hole v4: Use u64 >> 1 to avoid 64b div. Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk> Cc: Matthew Auld <matthew.auld@intel.com> Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20171117101732.4335-1-chris@chris-wilson.co.ukReviewed-by: NMatthew Auld <matthew.auld@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20171117162945.16390-1-chris@chris-wilson.co.uk
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