[newlib-cygwin] Cygwin: pipes: minor code cleanup

[Corinna Vinschen <corinna@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=44693e80b1dd6f97a674ddd383521a21c09c6dad

commit 44693e80b1dd6f97a674ddd383521a21c09c6dad
Author: Ken Brown <kbrown@cornell.edu>
Date:   Fri Sep 3 09:42:00 2021 -0400

    Cygwin: pipes: minor code cleanup
    
    Clarify a comment in raw_read, and remove a useless line from
    raw_write.

Diff:
---
 winsup/cygwin/fhandler_pipe.cc | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/winsup/cygwin/fhandler_pipe.cc b/winsup/cygwin/fhandler_pipe.cc
index 85730d039..81b1aed5e 100644
--- a/winsup/cygwin/fhandler_pipe.cc
+++ b/winsup/cygwin/fhandler_pipe.cc
@@ -248,8 +248,8 @@ fhandler_pipe::raw_read (void *ptr, size_t& len)
 
 	  WaitForSingleObject (read_mtx, INFINITE);
 
-	  /* Make sure never to request more bytes than half the pipe
-	     buffer size.  Every pending read lowers WriteQuotaAvailable
+	  /* If the pipe is empty, don't request more bytes than half the
+	     pipe buffer size.  Every pending read lowers WriteQuotaAvailable
 	     on the write side and thus affects select's ability to return
 	     more or less reliable info whether a write succeeds or not.
 
@@ -425,7 +425,6 @@ fhandler_pipe::raw_write (const void *ptr, size_t len)
 	    set_errno (EBADF);
 	  else
 	    __seterrno ();
-	  len = (size_t) -1;
 	}
       else if (NT_SUCCESS (status))
 	{