drm: Do not assign in if condition

checkpatch requires the assignment and the check to be separate
statements.

Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index 0d3a410..e8036fd 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -1613,7 +1613,8 @@
 	struct drm_bridge *bridge;
 	int ret;
 
-	if ((ret = drm_mode_group_init(dev, group)))
+	ret = drm_mode_group_init(dev, group);
+	if (ret)
 		return ret;
 
 	list_for_each_entry(crtc, &dev->mode_config.crtc_list, head)