make hangup or end of bridge trigger unhold action for held legs

src/switch_channel.c

@@ -3160,6 +3160,10 @@ SWITCH_DECLARE(switch_channel_state_t) switch_channel_perform_hangup(switch_chan
 	}
 	switch_mutex_unlock(channel->state_mutex);
 
+	if (switch_channel_test_flag(channel, CF_LEG_HOLDING)) {
+		switch_channel_mark_hold(channel, SWITCH_FALSE);
+	}
+
 	if (!ok) {
 		return channel->state;
 	}