2.2.18 bttv

[George]

A follow-up to my previous report about 2.2.18 bttv's new (worse) behavior:
Replacing 2.2.18's bttv.c with 2.2.17's fixes the problems.

- The green and purple fuzzy flash on a screen capture or channel change is
  gone.
- The screen works after loading the module without TV->Composite->TV in
  XawTV. (Especially important with automatic module loading.)

Hauppauge WinTV 401
00:14.0 Multimedia video controller: Brooktree Corporation Bt878 (rev 02)
        Subsystem: Hauppage computer works Inc.: Unknown device 13eb
        Flags: bus master, medium devsel, latency 32, IRQ 16
        Memory at e4001000 (32-bit, prefetchable)

S3 Virge DX
00:11.0 VGA compatible controller: S3 Inc. ViRGE/DX or /GX (rev 01) (prog-if 00 [VGA])
        Subsystem: S3 Inc. ViRGE/DX
        Flags: bus master, medium devsel, latency 32, IRQ 19
        Memory at e0000000 (32-bit, non-prefetchable)

Tyan Tomcat IV -- Pentium 233 MMX x2
00:00.0 Host bridge: Intel Corporation 430HX - 82439HX TXC [Triton II] (rev 03)
        Flags: bus master, medium devsel, latency 32

I can try to narrow it down further if someone has ideas or I'll just try
whatever I can in the large chunks changed.

-George Greer