[8445] Fixed redundant calculation of v and s on every login Author: arrai

The SRP-6 specifications clearly say, that v and s are only to be
    calculated on registering a user and changing his password; calculating
    them on every login is plain waste.

--HG--
branch : trunk

src/game/AccountMgr.cpp

@@ -145,7 +145,8 @@ AccountOpResult AccountMgr::ChangePassword(uint32 accid, std::string new_passwd)
     normalizeString(new_passwd);
 
     loginDatabase.escape_string(new_passwd);
-    if(!loginDatabase.PExecute("UPDATE account SET sha_pass_hash=SHA1(CONCAT(username,':','%s')) WHERE id='%d'", new_passwd.c_str(), accid))
+    // also reset s and v to force update at next realmd login
+    if(!loginDatabase.PExecute("UPDATE account SET v='0', s='0', sha_pass_hash=SHA1("_CONCAT3_("username","':'","'%s'")") WHERE id='%d'", new_passwd.c_str(), accid))
         return AOR_DB_INTERNAL_ERROR;                       // unexpected error
 
     return AOR_OK;