[newlib-cygwin] Cygwin: pipe: Simplify raw_write() a bit (Drop using chunk)

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=4899407e0e6129060cd1767744b4db82f164da36

commit 4899407e0e6129060cd1767744b4db82f164da36
Author: Takashi Yano <[email protected]>
Date:   Wed Jun 25 20:31:10 2025 +0900

    Cygwin: pipe: Simplify raw_write() a bit (Drop using chunk)
    
    There are tree variables for similar purpose in raw_write(), avail,
    chunk, and len1. avail is the amount of writable space in the pipe.
    len1 is the data length to attempt to NtWriteFile(). And chunk is
    intermediate value to calculate len1 from avail which holds
    min(avail, len). Here, chunk has no clear role among them. In fact,
    it appears to obscure the intent of the code for the reader.
    
    This patch removes the use of chunk and obtains len1 directly from
    avail.
    
    Reviewed-by: Johannes Schindelin <[email protected]>
    Signed-off-by: Takashi Yano <[email protected]>

Diff:
---
 winsup/cygwin/fhandler/pipe.cc | 10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

diff --git a/winsup/cygwin/fhandler/pipe.cc b/winsup/cygwin/fhandler/pipe.cc
index 3a0f8bfe9..1a8c39c5b 100644
--- a/winsup/cygwin/fhandler/pipe.cc
+++ b/winsup/cygwin/fhandler/pipe.cc
@@ -442,7 +442,6 @@ ssize_t
 fhandler_pipe_fifo::raw_write (const void *ptr, size_t len)
 {
   size_t nbytes = 0;
-  ULONG chunk;
   NTSTATUS status = STATUS_SUCCESS;
   IO_STATUS_BLOCK io;
   HANDLE evt;
@@ -543,11 +542,6 @@ fhandler_pipe_fifo::raw_write (const void *ptr, size_t len)
 	}
     }
 
-  if (len <= (size_t) avail)
-    chunk = len;
-  else
-    chunk = avail;
-
   if (!(evt = CreateEvent (NULL, false, false, NULL)))
     {
       __seterrno ();
@@ -564,8 +558,8 @@ fhandler_pipe_fifo::raw_write (const void *ptr, size_t len)
       ULONG len1;
       DWORD waitret = WAIT_OBJECT_0;
 
-      if (left > chunk && !is_nonblocking ())
-	len1 = chunk;
+      if (left > (size_t) avail && !is_nonblocking ())
+	len1 = (ULONG) avail;
       else
 	len1 = (ULONG) left;