[PATCH] cx88-dvb oops fix

Fixup error path, without that one the driver kills the machine by oopsing
in the IRQ handler in case the frontend initialization fails.

Signed-off-by: Gerd Knorr <kraxel@bytesex.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>