quartz: Data may be incomplete at the end of file so do not assert if we have less data than expected.

Samba 3.0.28a (as shipped with Ubuntu 8.04) seems to break when using
cached credentials backed by winbindd, returning a BH error in our test
if we still need to provide a password. Handle this and report a more
correct error.

wined3d: Report the driver description as reported by the Windows drivers when a device string is entered in our device table.

The distinction between PLAYING and STOPPED has always been whether
lpPlayPtr is NULL, so just use that instead of two states.

The WAVE_DIRECTSOUND bit of dwFlags isn't examined, so no point in correcting
it.