[PATCH v3] compat/winansi: fix die_lasterr() argument formatting

[Yongqiang Tian <yqtian668@gmail.com>]

During WinANSI initialization, duplicate_handle() reports the handle
when DuplicateHandle() fails. die_lasterr() collects the formatting
arguments in a va_list, but passes that va_list to die_errno() as an
ordinary variadic argument. die_errno() consequently formats part of
the va_list representation instead of the supplied handle, producing
an incorrect fatal message.

The helper also converts GetLastError() to errno, losing the exact
Windows error code.

Remove die_lasterr() and report GetLastError() directly at its four
call sites, following the existing Windows diagnostic style. This
passes the handle to the formatter correctly and preserves the Windows
error code. Keep the existing %li representation of the handle.

Helped-by: Johannes Sixt <j6t@kdbg.org>
Helped-by: René Scharfe <l.s.r@web.de>
Signed-off-by: Yongqiang Tian <yqtian668@gmail.com>
---

Changes since v2:
- Add Helped-by trailers for Johannes Sixt and René Scharfe.
- Move build validation details below the separator.
- No code changes.

Validation (performed for v2; the code is unchanged):
- Built compat/winansi.o with DEVELOPER=1 using MinGW GCC 13.
- Built and linked the complete git.exe.

 compat/winansi.c | 19 +++++--------------
 1 file changed, 5 insertions(+), 14 deletions(-)

diff --git a/compat/winansi.c b/compat/winansi.c
index 3ce1900939..088734a1df 100644
--- a/compat/winansi.c
+++ b/compat/winansi.c
@@ -436,15 +436,6 @@ static void winansi_exit(void)
 	CloseHandle(hthread);
 }
 
-static void die_lasterr(const char *fmt, ...)
-{
-	va_list params;
-	va_start(params, fmt);
-	errno = err_win_to_posix(GetLastError());
-	die_errno(fmt, params);
-	va_end(params);
-}
-
 #undef dup2
 int winansi_dup2(int oldfd, int newfd)
 {
@@ -462,8 +453,8 @@ static HANDLE duplicate_handle(HANDLE hnd)
 	HANDLE hresult, hproc = GetCurrentProcess();
 	if (!DuplicateHandle(hproc, hnd, hproc, &hresult, 0, TRUE,
 			DUPLICATE_SAME_ACCESS))
-		die_lasterr("DuplicateHandle(%li) failed",
-			(long) (intptr_t) hnd);
+		die("DuplicateHandle(%li) failed: %lu",
+		    (long) (intptr_t) hnd, GetLastError());
 	return hresult;
 }
 
@@ -609,16 +600,16 @@ void winansi_init(void)
 	hwrite = CreateNamedPipeW(name, PIPE_ACCESS_OUTBOUND,
 		PIPE_TYPE_BYTE | PIPE_WAIT, 1, BUFFER_SIZE, 0, 0, NULL);
 	if (hwrite == INVALID_HANDLE_VALUE)
-		die_lasterr("CreateNamedPipe failed");
+		die("CreateNamedPipe failed: %lu", GetLastError());
 
 	hread = CreateFileW(name, GENERIC_READ, 0, NULL, OPEN_EXISTING, 0, NULL);
 	if (hread == INVALID_HANDLE_VALUE)
-		die_lasterr("CreateFile for named pipe failed");
+		die("CreateFile for named pipe failed: %lu", GetLastError());
 
 	/* start console spool thread on the pipe's read end */
 	hthread = CreateThread(NULL, 0, console_thread, NULL, 0, NULL);
 	if (!hthread)
-		die_lasterr("CreateThread(console_thread) failed");
+		die("CreateThread(console_thread) failed: %lu", GetLastError());
 
 	/* schedule cleanup routine */
 	if (atexit(winansi_exit))
-- 
2.34.1