call: Only stop time when call is ended
The "active" call state can be reached multiple times: We need to take care not to start g_timer_new() more than once.
Originally filed as GNOME/calls#502 (closed)
The "active" call state can be reached multiple times: We need to take care not to start g_timer_new() more than once.
Originally filed as GNOME/calls#502 (closed)