[gtk/gtk-4-6] gtkplacessidebar: Prevent calling g_object_unref on null

[Matthias Clasen <matthiasc src gnome org>]

commit 9cc051ffa58327183362b321a1696a475a29d02c
Author: Fina Wilke <code felinira net>
Date:   Mon Mar 14 22:33:35 2022 +0100

    gtkplacessidebar: Prevent calling g_object_unref on null
    
    g_object_unref would be called on a null end_icon when provider_account_status
    is CLOUD_PROVIDERS_ACCOUNT_STATUS_IDLE

 gtk/gtkplacessidebar.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
---
diff --git a/gtk/gtkplacessidebar.c b/gtk/gtkplacessidebar.c
index edc0620189..60f07e4558 100644
--- a/gtk/gtkplacessidebar.c
+++ b/gtk/gtkplacessidebar.c
@@ -921,7 +921,10 @@ create_cloud_provider_account_row (GtkPlacesSidebar      *sidebar,
 
       g_free (tooltip);
       g_free (mount_uri);
-      g_object_unref (end_icon);
+      if (end_icon) {
+        g_object_unref (end_icon);
+      }
+      
       return TRUE;
     }
   else