[newlib-cygwin] Cygwin: select: Fix a bug on closing pi->bye event.

[Corinna Vinschen]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=c8b076a23361fa9ebaec09d01253043ca2948f24

commit c8b076a23361fa9ebaec09d01253043ca2948f24
Author: Takashi Yano via Cygwin-patches <cygwin-patches@cygwin.com>
Date:   Thu Aug 27 18:46:20 2020 +0900

    Cygwin: select: Fix a bug on closing pi->bye event.
    
    - Close event handle pi->bye only if it was created.
      Addresses:
      https://cygwin.com/pipermail/cygwin-developers/2020-August/011948.html

Diff:
---
 winsup/cygwin/select.cc | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/winsup/cygwin/select.cc b/winsup/cygwin/select.cc
index 9f1a8a57a..501714fa7 100644
--- a/winsup/cygwin/select.cc
+++ b/winsup/cygwin/select.cc
@@ -783,8 +783,8 @@ pipe_cleanup (select_record *, select_stuff *stuff)
       pi->stop_thread = true;
       SetEvent (pi->bye);
       pi->thread->detach ();
+      CloseHandle (pi->bye);
     }
-  CloseHandle (pi->bye);
   delete pi;
   stuff->device_specific_pipe = NULL;
 }
@@ -978,8 +978,8 @@ fifo_cleanup (select_record *, select_stuff *stuff)
       pi->stop_thread = true;
       SetEvent (pi->bye);
       pi->thread->detach ();
+      CloseHandle (pi->bye);
     }
-  CloseHandle (pi->bye);
   delete pi;
   stuff->device_specific_fifo = NULL;
 }
@@ -1344,8 +1344,8 @@ pty_slave_cleanup (select_record *me, select_stuff *stuff)
       pi->stop_thread = true;
       SetEvent (pi->bye);
       pi->thread->detach ();
+      CloseHandle (pi->bye);
     }
-  CloseHandle (pi->bye);
   delete pi;
   stuff->device_specific_ptys = NULL;
 }