drm/amd/display: fix the broken logic in dc_link.c

Add missing braces.
Signed-off-by: Yifan Zhang <yifan1.zhang@amd.com>
Reviewed-by: Feifei Xu <Feifei.Xu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/core/dc_link.c

@@ -422,8 +422,9 @@ static enum signal_type link_detect_sink(struct dc_link *link,
 	 */
 
 	/* PCIE detects the actual connector on add-on board */
-	if (link->link_id.id == CONNECTOR_ID_PCIE)
+	if (link->link_id.id == CONNECTOR_ID_PCIE) {
 		/* ZAZTODO implement PCIE add-on card detection */
+	}
 
 	switch (link->link_id.id) {
 	case CONNECTOR_ID_HDMI_TYPE_A: {