Fixed possible memory leak in ipban_func_del() when returning without calling ipban_unload_entry() on variable 'to_delete'

src/bnetd/ipban.cpp

@@ -584,6 +584,7 @@ namespace pvpgn
 					if (!entry)
 					{
 						eventlog(eventlog_level_error, __FUNCTION__, "ipbanlist contains NULL item");
+						ipban_unload_entry(to_delete);
 						return -1;
 					}
 					if (ipban_identical_entry(to_delete, entry))