[gnome-software/flatpak-dispose-monitor] flatpak: Add missing unref of GFileMonitor

[Phaedrus Leeds <mwleeds src gnome org>]

commit 24806b47bebb11281df83ec8a5d6ba9efe08c5a4
Author: Phaedrus Leeds <mwleeds protonmail com>
Date:   Thu Feb 24 15:28:13 2022 -0800

    flatpak: Add missing unref of GFileMonitor

 plugins/flatpak/gs-flatpak.c | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/plugins/flatpak/gs-flatpak.c b/plugins/flatpak/gs-flatpak.c
index 0ce1b7e0e..55c317558 100644
--- a/plugins/flatpak/gs-flatpak.c
+++ b/plugins/flatpak/gs-flatpak.c
@@ -4056,6 +4056,7 @@ gs_flatpak_finalize (GObject *object)
 
        g_free (self->id);
        g_object_unref (self->installation);
+       g_object_unref (self->monitor);
        g_clear_pointer (&self->installed_refs, g_ptr_array_unref);
        g_mutex_clear (&self->installed_refs_mutex);
        g_object_unref (self->plugin);