camera-monitor: fix memleak in on_camera_added
camera-monitor: fix memleak in on_camera_added

https://bugzilla.gnome.org/show_bug.cgi?id=665256

GNOME/telepathy-account-widgets,Distrotech/telepathy-account-widgets,GNOME/telepathy-account-widgets,Distrotech/telepathy-account-widgets,GNOME/telepathy-account-widgets