gnutls: free op_mutex in finalize()
gnutls: free op_mutex in finalize()

https://bugzilla.gnome.org/show_bug.cgi?id=693718

GNOME/glib-networking,Distrotech/glib-networking,Distrotech/glib-networking,GNOME/glib-networking,Distrotech/glib-networking,GNOME/glib-networking