(svn r1923) - Fix: [ 1155696 ] Crash with german umlauts in station names. The width was not calculated using unsigned values, so all characters above 128 were "negative"

- Codechange: a more proper check for a null pointer in tunnelbridge_cmd.c should have gone in with the previous commit

tunnelbridge_cmd.c

@@ -609,7 +609,8 @@ uint CheckTunnelBusy(uint tile, int *length)
 		return (uint)-1;
 	}
 
-	if (length) *length = len;
+	if (length != NULL)
+		*length = len;
 	return tile;
 }