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

[Phaedrus Leeds <mwleeds src gnome org>]

commit b40099448006f860ebbcb7e1efb5f5d2a4fb7459
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 | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/plugins/flatpak/gs-flatpak.c b/plugins/flatpak/gs-flatpak.c
index 0ce1b7e0e..0f41babe8 100644
--- a/plugins/flatpak/gs-flatpak.c
+++ b/plugins/flatpak/gs-flatpak.c
@@ -4053,6 +4053,8 @@ gs_flatpak_finalize (GObject *object)
        }
        if (self->silo != NULL)
                g_object_unref (self->silo);
+       if (self->monitor != NULL)
+               g_object_unref (self->monitor);
 
        g_free (self->id);
        g_object_unref (self->installation);