drm/i915: Use unsigned long for obj->user_pin_count
At least on linux sizeof(long) == sizeof(void*) and the thinking is that you can grab about as many references as there's memory. Doesn't really matter, just a bit of OCD since the fixed size data type in a pure in-kernel datastructure look off. v2: Ville asked for an overflow check since no one prevents userspace from incrementing the pin count forever. v3: s/INT/LONG/, noticed by Chris. Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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