Tentative fix for travis

This undoes a lock-unlock for LOCK_thread_count.

sql/log.cc

@@ -4178,6 +4178,7 @@ bool MYSQL_BIN_LOG::reset_logs(THD *thd, bool create_new_log,
     mysql_mutex_unlock(&LOCK_xid_list);
   }
 
+  mysql_mutex_lock(&LOCK_thread_count);
   /* Save variables so that we can reopen the log */
   save_name=name;
   name=0;					// Protect against free
@@ -4285,6 +4286,8 @@ bool MYSQL_BIN_LOG::reset_logs(THD *thd, bool create_new_log,
   if (error == 1)
     name= const_cast<char*>(save_name);
 
+  mysql_mutex_unlock(&LOCK_thread_count);
+
   if (!is_relay_log)
   {
     xid_count_per_binlog *b;