* fhandler.h (fhandler_serial::fhandler_serial): Change to only accept unit

argument.
* fhandler_serial.cc (fhandler_serial::fhandler_serial): Ditto.
(fhandler_serial::open): Avoid else when previous clause is a return().
* path.cc (get_devn): Alias /dev/ttyS0 -> /dev/com1, etc.
(get_device_number): Reallow standalone "com1" as a valid name for /dev/com1.

winsup/cygwin/select.cc

@@ -352,7 +352,7 @@ out:
 
 static int
 set_bits (select_record *me, fd_set *readfds, fd_set *writefds,
-	   fd_set *exceptfds)
+	  fd_set *exceptfds)
 {
   int ready = 0;
   select_printf ("me %p, testing fd %d (%s)", me, me->fd, me->fh->get_name ());