refs mariadb-corporation/galera#308

- Avoid calling wsrep->stats_free() directly, instead, use wsrep_free_status().

Author: Daniele Sciascia

sql/sql_class.cc

@@ -1837,7 +1837,7 @@ THD::~THD()
  mysql_mutex_unlock(&LOCK_wsrep_thd);
  mysql_mutex_destroy(&LOCK_wsrep_thd);
  if (wsrep_rgi) delete wsrep_rgi;
- if (wsrep_status_vars) wsrep->stats_free(wsrep, wsrep_status_vars);
+ wsrep_free_status(this);
 #endif
  /* Close connection */
 #ifndef EMBEDDED_LIBRARY

sql/wsrep_var.cc

@@ -567,10 +567,7 @@ static void export_wsrep_status_to_mysql(THD* thd)
 {
  int wsrep_status_len, i;
 
- if (thd->wsrep_status_vars)
- {
- wsrep->stats_free(wsrep, thd->wsrep_status_vars);
- }
+ wsrep_free_status(thd);
 
  thd->wsrep_status_vars = wsrep->stats_get(wsrep);