[PATCH] ieee1394: single buffer fixes to video1394

Apply and fixup patch from Markus Tavenrath <speedygoo@speedygoo.de> for
video1394 to allow only a single buffer on receive and two buffers on
transmit.  Tested with libdc1394 and dvconnect (libdv).
Signed-off-by: Dan Dennedy <dan@dennedy.org>
Signed-off-by: Jody McIntyre <scjody@steamballoon.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>