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

[Takashi Yano via Cygwin-cvs]

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

commit 8d3271b7fa4ceed4825ce125123b75447ef18d53
Author: Takashi Yano <takashi.y...@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];