media: videobuf2: always set buffer vb2 pointer
commit 67f85135 upstream. We need to always link allocated vb2_dc_buf back to vb2_buffer because we dereference vb2 in prepare() and finish() callbacks. Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org> Tested-by: Chen-Yu Tsai <wenst@chromium.org> Acked-by: Tomasz Figa <tfiga@chromium.org> Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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