refs codership/mysql-wsrep#98 fixed sidno initialization

Sidno initialization was skipped in wsrep_sst_received() if the
received position matched to current position. However, sidno
initialization must be done every time server is started to
add inverted group uuid into sidno map.

sql/wsrep_mysqld.h

@@ -324,4 +324,5 @@ int wsrep_alter_event_query(THD *thd, uchar** buf, size_t* buf_len);
 #ifdef GTID_SUPPORT
 void wsrep_init_sidno(const wsrep_uuid_t&);
 #endif /* GTID_SUPPORT */
+
 #endif /* WSREP_MYSQLD_H */