drm/crtc: Remove redundant NULL check before kfree

kfree() on a NULL input is a no-op. Hence remove the check.
Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/drm_crtc.c

@@ -470,10 +470,8 @@ void drm_crtc_cleanup(struct drm_crtc *crtc)
 {
 	struct drm_device *dev = crtc->dev;
 
-	if (crtc->gamma_store) {
-		kfree(crtc->gamma_store);
-		crtc->gamma_store = NULL;
-	}
+	kfree(crtc->gamma_store);
+	crtc->gamma_store = NULL;
 
 	drm_mode_object_put(dev, &crtc->base);
 	list_del(&crtc->head);