wined3d: Don't allow a negative lock_count in buffer_Unmap.
[wine] / dlls / crtdll /
drwxr-xr-x   ..
-rw-r--r-- 344 Makefile.in
-rw-r--r-- 21335 crtdll.spec
-rw-r--r-- 5379 crtdll_main.c