cell: added null ptr check in xm_flush_frontbuffer()

diff --git a/src/gallium/winsys/xlib/xlib_cell.c b/src/gallium/winsys/xlib/xlib_cell.c
index c87564f4dc1ed168a0ced5b8acaf910453e505eb..40bcdfe42a0f31eb4e462c72218b27932322c722 100644 (file)
--- a/src/gallium/winsys/xlib/xlib_cell.c
+++ b/src/gallium/winsys/xlib/xlib_cell.c
@@ -222,7 +222,8 @@ xm_flush_frontbuffer(struct pipe_winsys *pws,
     * This function copies that XImage to the actual X Window.
     */
    XMesaContext xmctx = (XMesaContext) context_private;
-   xlib_cell_display_surface(xmctx->xm_buffer, surf);
+   if (xmctx)
+      xlib_cell_display_surface(xmctx->xm_buffer, surf);
 }