drm/radeon/gem: don't leak a gem object if reserve fails on get tiling (v2)

Not sure it ever happens in practice, spotted during code review.

spare brace snuck in
Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/radeon/radeon_gem.c

@@ -351,9 +351,10 @@ int radeon_gem_get_tiling_ioctl(struct drm_device *dev, void *data,
 	rbo = gobj->driver_private;
 	r = radeon_bo_reserve(rbo, false);
 	if (unlikely(r != 0))
-		return r;
+		goto out;
 	radeon_bo_get_tiling_flags(rbo, &args->tiling_flags, &args->pitch);
 	radeon_bo_unreserve(rbo);
+out:
 	mutex_lock(&dev->struct_mutex);
 	drm_gem_object_unreference(gobj);
 	mutex_unlock(&dev->struct_mutex);