drm/i915: Correctly return -ENOMEM on allocation failure in cmdbuf ioctls.

Signed-off-by: Owain G. Ainsworth <oga@openbsd.org>
Signed-off-by: Eric Anholt <eric@anholt.net>
diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index e660ac0..2307f98 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -735,8 +735,10 @@
 	if (cmdbuf->num_cliprects) {
 		cliprects = kcalloc(cmdbuf->num_cliprects,
 				    sizeof(struct drm_clip_rect), GFP_KERNEL);
-		if (cliprects == NULL)
+		if (cliprects == NULL) {
+			ret = -ENOMEM;
 			goto fail_batch_free;
+		}
 
 		ret = copy_from_user(cliprects, cmdbuf->cliprects,
 				     cmdbuf->num_cliprects *