drm/vmwgfx: Fix an fb unlocking bug

A regression introduced when the master ttm lock was split into two.

Reported-and-tested-by: Brian Paul <brianp@vmware.com>
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Brian Paul <brianp@vmware.com>
1 file changed