[PATCH v2 3/3] winex11.drv: Don't compare error event serial if it's zero.

[Zhiyi Zhang]

From: Zhiyi Zhang

Sometimes error event serial is zero. For example, NVIDIA driver may send X_GLXCopyContext errors
with the event serial set to zero. When it's zero, previously the error handler passes the error
to the default error handler and cause application crashes.

Signed-off-by: Zhiyi Zhang 
---
 dlls/winex11.drv/x11drv_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/dlls/winex11.drv/x11drv_main.c b/dlls/winex11.drv/x11drv_main.c
index 4fe450237d3..44d4763b316 100644
--- a/dlls/winex11.drv/x11drv_main.c
+++ b/dlls/winex11.drv/x11drv_main.c
@@ -304,7 +304,7 @@ int X11DRV_check_error(void)
 static int error_handler( Display *display, XErrorEvent *error_evt )
 {
     if (err_callback && display == err_callback_display &&
-        (long)(error_evt->serial - err_serial) >= 0)
+        (!error_evt->serial || error_evt->serial >= err_serial))
     {
         if ((err_callback_result = err_callback( display, error_evt, err_callback_arg )))
         {