[PATCH v6 10/12] winex11.drv: Avoid crashing on invalid pixel format pointer.

[Rémi Bernon]

From: Rémi Bernon

---
 dlls/winex11.drv/opengl.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/dlls/winex11.drv/opengl.c b/dlls/winex11.drv/opengl.c
index c74c317f6ff..616d580ab34 100644
--- a/dlls/winex11.drv/opengl.c
+++ b/dlls/winex11.drv/opengl.c
@@ -2824,6 +2824,7 @@ static BOOL X11DRV_wglGetPixelFormatAttribivARB( HDC hdc, int iPixelFormat, int
             case WGL_SWAP_METHOD_ARB:
                 if (has_swap_method)
                 {
+                    if (!fmt) goto pix_error;
                     hTest = pglXGetFBConfigAttrib(gdi_display, fmt->fbconfig, GLX_SWAP_METHOD_OML, &tmp);
                     if (hTest) goto get_error;
                     switch (tmp)