drm/crtc: fix mismerge of last patch.

We only want to NULL encoder->crtc when it is off.
Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/drm_crtc_helper.c

@@ -278,10 +278,10 @@ void drm_helper_disable_unused_functions(struct drm_device *dev)
 				(*encoder_funcs->disable)(encoder);
 			else
 				(*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
-		}
 			/* disconnector encoder from any connector */
 			encoder->crtc = NULL;
 		}
+	}
 
 	list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 		struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;