[media] v4l2-mem2mem: support events in v4l2_m2m_poll
v4l2_m2m_poll didn't support events, but that's essential if you want to be able to use control events for example. Signed-off-by: NHans Verkuil <hans.verkuil@cisco.com> Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>
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