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Hans Verkuil committed 715bfb3e1f0
[media] DocBook media: document VIDIOC_QUERY_EXT_CTRL Document the new VIDIOC_QUERY_EXT_CTRL ioctl. Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>