[PATCH 4.2.y-ckt 013/273] drm/vmwgfx: Fix an fb unlocking bug

4.2.8-ckt5 -stable review patch. If anyone has any objections, please let me know. ---8< From: Thomas Hellstrom commit 12617971c443c50750a12a77ea0e08319d161975 upstream. A regression introduced when the

[PATCH 4.2.y-ckt 013/273] drm/vmwgfx: Fix an fb unlocking bug

4.2.8-ckt5 -stable review patch. If anyone has any objections, please let me know. ---8< From: Thomas Hellstrom commit 12617971c443c50750a12a77ea0e08319d161975 upstream. A regression introduced when the master ttm lock was split