[newlib-cygwin] Cygwin: fhandler_fifo::delete_client_handler: improve efficiency

[Ken Brown <kbrown@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=49a9ffdf4bcb3388cde5e4f441dd710701136ba7

commit 49a9ffdf4bcb3388cde5e4f441dd710701136ba7
Author: Ken Brown <kbrown@cornell.edu>
Date:   Wed Aug 26 18:21:20 2020 -0400

    Cygwin: fhandler_fifo::delete_client_handler: improve efficiency
    
    Delete a client handler by swapping it with the last one in the list
    instead of calling memmove.

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

diff --git a/winsup/cygwin/fhandler_fifo.cc b/winsup/cygwin/fhandler_fifo.cc
index b3c4c4a25..75c8406fe 100644
--- a/winsup/cygwin/fhandler_fifo.cc
+++ b/winsup/cygwin/fhandler_fifo.cc
@@ -377,14 +377,14 @@ fhandler_fifo::add_client_handler (bool new_pipe_instance)
   return 0;
 }
 
-/* Always called with fifo_client_lock in place. */
+/* Always called with fifo_client_lock in place.  Delete a
+   client_handler by swapping it with the last one in the list. */
 void
 fhandler_fifo::delete_client_handler (int i)
 {
   fc_handler[i].close ();
   if (i < --nhandlers)
-    memmove (fc_handler + i, fc_handler + i + 1,
-	     (nhandlers - i) * sizeof (fc_handler[i]));
+    fc_handler[i] = fc_handler[nhandlers];
 }
 
 /* Delete handlers that we will never read from.  Always called with