[gtk] gdkdisplay-wayland: only remove one monitor

[Timm Bäder <baedert src gnome org>]

commit ae711d830110ac194370956308c74c91d8b69ef9
Author: Timm Bäder <mail baedert org>
Date:   Wed May 20 15:50:17 2020 +0200

    gdkdisplay-wayland: only remove one monitor
    
    Ids here are unique, so break out of the loop once we found the monitor
    with the given ID.

 gdk/wayland/gdkdisplay-wayland.c | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/gdk/wayland/gdkdisplay-wayland.c b/gdk/wayland/gdkdisplay-wayland.c
index f323a732f6..1b65c46bde 100644
--- a/gdk/wayland/gdkdisplay-wayland.c
+++ b/gdk/wayland/gdkdisplay-wayland.c
@@ -2530,6 +2530,8 @@ gdk_wayland_display_remove_output (GdkWaylandDisplay *self,
           g_list_store_remove (self->monitors, i);
           gdk_monitor_invalidate (GDK_MONITOR (monitor));
           update_scale (GDK_DISPLAY (self));
+          g_object_unref (monitor);
+          break;
         }
 
       g_object_unref (monitor);