Merge tnurnberg@bk-internal.mysql.com:/home/bk/mysql-5.1-opt

into  mysql.com:/misc/mysql/32707/51-32707

sql/protocol.cc

@@ -293,7 +293,10 @@ void net_send_error_packet(THD *thd, uint sql_errno, const char *err)
 {
   NET *net= &thd->net;
   uint length;
-  uchar buff[MYSQL_ERRMSG_SIZE+2], *pos;
+  /*
+    buff[]: sql_errno:2 + ('#':1 + SQLSTATE_LENGTH:5) + MYSQL_ERRMSG_SIZE:512
+  */
+  uchar buff[2+1+SQLSTATE_LENGTH+MYSQL_ERRMSG_SIZE], *pos;
 
   DBUG_ENTER("send_error_packet");