Alexandre Julliard : ntdll: Don't copy a missing context in get_thread_context().

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 8dc2cc24d713ff9c9b38039e33ae951f90372e69
URL:    https://gitlab.winehq.org/wine/wine/-/commit/8dc2cc24d713ff9c9b38039e33ae951...

Author: Alexandre Julliard <julliard(a)winehq.org>
Date:   Fri Mar  8 09:51:56 2024 +0100

ntdll: Don't copy a missing context in get_thread_context().

Fixes a test failure on ARM64EC.

---

 dlls/ntdll/unix/thread.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/dlls/ntdll/unix/thread.c b/dlls/ntdll/unix/thread.c
index 7f2f1b9a50e..60c833b0320 100644
--- a/dlls/ntdll/unix/thread.c
+++ b/dlls/ntdll/unix/thread.c
@@ -1790,7 +1790,7 @@ NTSTATUS get_thread_context( HANDLE handle, void *context, BOOL *self, USHORT ma
         }
         SERVER_END_REQ;
     }
-    if (!ret)
+    if (!ret && count)
     {
         ret = context_from_server( context, &server_contexts[0], machine );
         if (!ret && count > 1) ret = context_from_server( context, &server_contexts[1], machine );