drm/ast: Remove unecessary NULL check in gem_free
The ->gem_free_object never gets called with a NULL pointer, the check is redundant. Also checking after the upcast allows compilers to elide it anyway. Spotted by coverity. v2: Fix patch subject. Reviewed-by: David Herrmann <dh.herrmann@gmail.com> Reviewed-by: Ian Romanick <ian.d.romanick@intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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