[calls] mm-provider: Don't leak MMManager

[Evangelos Ribeiro Tzaras <devrtz src gnome org>]

commit f44e8025c9039d76fde585fa6daf521e64f26e26
Author: Evangelos Ribeiro Tzaras <devrtz fortysixandtwo eu>
Date:   Sat Sep 3 11:03:39 2022 +0200

    mm-provider: Don't leak MMManager

 plugins/provider/mm/calls-mm-provider.c | 5 +++++
 1 file changed, 5 insertions(+)
---
diff --git a/plugins/provider/mm/calls-mm-provider.c b/plugins/provider/mm/calls-mm-provider.c
index 64d05554..a850ac5e 100644
--- a/plugins/provider/mm/calls-mm-provider.c
+++ b/plugins/provider/mm/calls-mm-provider.c
@@ -324,6 +324,9 @@ mm_vanished_cb (GDBusConnection *connection,
                 CallsMMProvider *self)
 {
   g_debug ("ModemManager vanished from D-Bus");
+
+  g_clear_object (&self->mm);
+
   g_list_store_remove_all (self->origins);
   update_status (self);
 }
@@ -387,6 +390,8 @@ dispose (GObject *object)
 {
   CallsMMProvider *self = CALLS_MM_PROVIDER (object);
 
+  g_clear_object (&self->mm);
+
   g_clear_handle_id (&self->watch_id, g_bus_unwatch_name);
 
   g_list_store_remove_all (self->origins);