Comment 2 for bug 963322

StacktraceTop:
 gcm_prefs_add_device (prefs=0x7f7187453750, device=0x7f7187e2d9f0) at cc-color-panel.c:1915
 gcm_prefs_device_added_cb (client=<optimized out>, device=<optimized out>, prefs=0x7f7187453750) at cc-color-panel.c:2044
 g_cclosure_marshal_VOID__OBJECTv (closure=0x7f7187a5f7c0, return_value=<optimized out>, instance=0x7f7187cfe240, args=<optimized out>, marshal_data=<optimized out>, n_params=<optimized out>, param_types=0x7f71877aa420) at /build/buildd/glib2.0-2.31.22/./gobject/gmarshal.c:1312
 _g_closure_invoke_va (closure=0x7f7187a5f7c0, return_value=0x0, instance=0x7f7187cfe240, args=0x7fff47d44538, n_params=1, param_types=<optimized out>) at /build/buildd/glib2.0-2.31.22/./gobject/gclosure.c:840
 g_signal_emit_valist (instance=<optimized out>, signal_id=<optimized out>, detail=0, var_args=<optimized out>) at /build/buildd/glib2.0-2.31.22/./gobject/gsignal.c:3207