wined3d: improve thread safety in IWineD3DSurfaceImpl_BltOverride

[Alexander Dorofeyev]

Fixes crash in Aliens vs Predator 2 loading screen (bug # 4513
http://bugs.winehq.org/show_bug.cgi?id=4513).

---
   dlls/wined3d/surface.c |    5 +++++
   1 files changed, 5 insertions(+), 0 deletions(-)

-------------- next part --------------
A non-text attachment was scrubbed...
Name: 6e2dfafc0e18c9f394e723433549e92c4238dd95.diff
Type: text/x-patch
Size: 1377 bytes
Desc: not available
Url : http://www.winehq.org/pipermail/wine-patches/attachments/20071210/3aa84f48/attachment.bin