[newlib-cygwin] Cygwin: console: Add attach_mutex guard that was not added.

[Takashi Yano]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=8d3271b7fa4ceed4825ce125123b75447ef18d53

commit 8d3271b7fa4ceed4825ce125123b75447ef18d53
Author: Takashi Yano <takashi.yano@nifty.ne.jp>
Date:   Fri Mar 18 23:28:36 2022 +0900

    Cygwin: console: Add attach_mutex guard that was not added.

Diff:
---
 winsup/cygwin/fhandler_console.cc | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/winsup/cygwin/fhandler_console.cc b/winsup/cygwin/fhandler_console.cc
index b92d758d1..68248d16c 100644
--- a/winsup/cygwin/fhandler_console.cc
+++ b/winsup/cygwin/fhandler_console.cc
@@ -362,7 +362,9 @@ remove_record:
 		  {
 		    if (total_read + j - i >= n)
 		      { /* Something is wrong. Giving up. */
+			acquire_attach_mutex (mutex_timeout);
 			WriteConsoleInputW (p->input_handle, tmp, n, &n);
+			release_attach_mutex ();
 			goto skip_writeback;
 		      }
 		    input_rec[total_read + j - i] = tmp[j];