drm/i915: Remove redundant test in error path.

The error path for object list being null is in the second goto target.
Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Dave Airlie <airlied@linux.ie>

drivers/gpu/drm/i915/i915_gem.c

@@ -2613,13 +2613,12 @@ i915_gem_execbuffer(struct drm_device *dev, void *data,
 			  "back to user (%d)\n",
 			   args->buffer_count, ret);
 err:
-	if (object_list != NULL) {
 	for (i = 0; i < pinned; i++)
 		i915_gem_object_unpin(object_list[i]);
 
 	for (i = 0; i < args->buffer_count; i++)
 		drm_gem_object_unreference(object_list[i]);
-	}
+
 	mutex_unlock(&dev->struct_mutex);
 
 pre_mutex_err: