* fhandler_tty.cc (fhandler_pty_master::process_slave_output): Set length field

correctly when "need_nl".

winsup/cygwin/fhandler_tty.cc

@@ -233,6 +233,7 @@ fhandler_pty_master::process_slave_output (char *buf, size_t len, int pktmode_on
 	 don't check again here.  */
       buf[0] = '\n';
       need_nl = 0;
+      rc = 1;
       goto out;
     }