[media] cx88: drop cx88_free_buffer

Remove this function. This makes all vb2 queues behave the same, which
simplifies comparing the various vb2 queue op implementations.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

diff --cc drivers/media/pci/cx88/cx88-blackbird.c
Simple merge

diff --cc drivers/media/pci/cx88/cx88-core.c
Simple merge

diff --cc drivers/media/pci/cx88/cx88-dvb.c
Simple merge

diff --cc drivers/media/pci/cx88/cx88-mpeg.c
Simple merge

diff --cc drivers/media/pci/cx88/cx88-vbi.c
Simple merge

diff --cc drivers/media/pci/cx88/cx88-video.c
Simple merge

diff --cc drivers/media/pci/cx88/cx88.h
Simple merge