[gnome-control-center/gnome-3-38] display:Fix null pointer dereference

[Robert Ancell <rancell src gnome org>]

commit d26e4c1d292c4a663a320a4b05501d926ae81f08
Author: vitorramos <ramos vitor89 gmail com>
Date:   Wed Nov 25 16:55:20 2020 +0100

    display:Fix null pointer dereference

 panels/display/cc-display-panel.c | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/panels/display/cc-display-panel.c b/panels/display/cc-display-panel.c
index dfca98cc6..f58aaa8b5 100644
--- a/panels/display/cc-display-panel.c
+++ b/panels/display/cc-display-panel.c
@@ -866,6 +866,10 @@ reset_current_config (CcDisplayPanel *panel)
   panel->current_output = NULL;
 
   current = cc_display_config_manager_get_current (panel->manager);
+
+  if (!current)
+    return;
+  
   cc_display_config_set_minimum_size (current, MINIMUM_WIDTH, MINIMUM_HEIGHT);
   panel->current_config = current;