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media: videobuf2-core: copy vb planes unconditionally

Hans Verkuil requested to merge linux-media/users/hverkuil:prfix into fixes 
Copy the relevant data from userspace to the vb->planes unconditionally
as it's possible some of the fields may have changed after the buffer
has been validated.

Keep the dma_buf_put(planes[plane].dbuf) calls in the first
`if (!reacquired)` case, in order to be close to the plane validation code
where the buffers were got in the first place.

Cc: stable@vger.kernel.org
Fixes: 95af7c00f35b ("media: videobuf2-core: release all planes first in __prepare_dmabuf()")
Signed-off-by: Tudor Ambarus <tudor.ambarus@linaro.org>
Tested-by: Will McVicker <willmcvicker@google.com>
Acked-by: Tomasz Figa <tfiga@chromium.org>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>

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