mod_fifo: Refactor DTMF exit key matching

src/mod/applications/mod_fifo/mod_fifo.c

@@ -470,10 +470,8 @@ static switch_status_t on_dtmf(switch_core_session_t *session, void *input, swit
 
 			if (switch_channel_test_flag(switch_core_session_get_channel(session), CF_BRIDGE_ORIGINATOR)) {
 				const char *consumer_exit_key = switch_channel_get_variable(channel, "fifo_consumer_exit_key");
-				if (consumer_exit_key && dtmf->digit == *consumer_exit_key) {
-					switch_channel_hangup(bchan, SWITCH_CAUSE_NORMAL_CLEARING);
-					return SWITCH_STATUS_BREAK;
-				} else if (!consumer_exit_key && dtmf->digit == '*') {
+				if (!consumer_exit_key) consumer_exit_key = "*";
+				if (dtmf->digit == *consumer_exit_key) {
 					switch_channel_hangup(bchan, SWITCH_CAUSE_NORMAL_CLEARING);
 					return SWITCH_STATUS_BREAK;
 				} else if (dtmf->digit == '0') {