svga: Prevent potential null pointer dereference in vmw_surface.c.

diff --git a/src/gallium/winsys/drm/vmware/core/vmw_surface.c b/src/gallium/winsys/drm/vmware/core/vmw_surface.c
index c19e556df9fe47b1cbc8c5b29020443c950b4951..64eb32f8b94ef8f52356ef27af5c99409f50e03c 100644 (file)
--- a/src/gallium/winsys/drm/vmware/core/vmw_surface.c
+++ b/src/gallium/winsys/drm/vmware/core/vmw_surface.c
@@ -37,11 +37,13 @@ vmw_svga_winsys_surface_reference(struct vmw_svga_winsys_surface **pdst,
 {
    struct pipe_reference *src_ref;
    struct pipe_reference *dst_ref;
-   struct vmw_svga_winsys_surface *dst = *pdst;
-   
+   struct vmw_svga_winsys_surface *dst;
+
    if(pdst == NULL || *pdst == src)
       return;
-   
+
+   dst = *pdst;
+
    src_ref = src ? &src->refcnt : NULL;
    dst_ref = dst ? &dst->refcnt : NULL;