logsys: Unlock config mutex on error

Thanks Ryan Cai <ycaibb@gmail.com> for reporting the problem.

Signed-off-by: Jan Friesse <jfriesse@redhat.com>
Reviewed-by: Christine Caulfield <ccaulfie@redhat.com>
(cherry picked from commit 60dbacaeb4a96fa6b818af737ea45f23e5ea5464)

exec/logsys.c

@@ -380,6 +380,8 @@ int _logsys_system_setup(
 	qb_log_ctl(QB_LOG_BLACKBOX, QB_LOG_CONF_ENABLED, QB_FALSE);
 
 	if (logsys_format_set(NULL) == -1) {
+		pthread_mutex_unlock (&logsys_config_mutex);
+
 		return -1;
 	}