FB8-96: Remove special formatting for user name when writing to audit…

… plugin log (facebook#948)

Summary:
Jira issue: https://jira.percona.com/browse/FB8-96

Reference patch: facebook@3b47dae
Reference patch: facebook@87e0683
Pull Request resolved: facebook#948

Reviewed By: lth

Differential Revision: D13941932

Pulled By: lth

fbshipit-source-id: a0ff808

sql/sql_audit.cc

@@ -364,7 +364,6 @@ int mysql_audit_notify(THD *thd, mysql_event_general_subclass_t subclass,
                        const char *subclass_name, int error_code,
                        const char *msg, size_t msg_len) {
   mysql_event_general event;
-  char user_buff[MAX_USER_HOST_SIZE];
 
   DBUG_ASSERT(thd);
 
@@ -378,8 +377,8 @@ int mysql_audit_notify(THD *thd, mysql_event_general_subclass_t subclass,
 
   Security_context *sctx = thd->security_context();
 
-  event.general_user.str = user_buff;
-  event.general_user.length = make_user_name(sctx, user_buff);
+  event.general_user.str = sctx->user().str;
+  event.general_user.length = sctx->user().str ? sctx->user().length : 0;
   event.general_ip = sctx->ip();
   event.general_host = sctx->host();
   event.general_external_user = sctx->external_user();