media: vb2: fix epoll() by calling poll_wait first
The epoll function expects that whenever the poll file op is
called, the poll_wait function is also called. That didn't
always happen in vb2_core_poll() and vb2_poll(). Fix this,
otherwise epoll() would timeout when it shouldn't.
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Reported-by: Yi Qingliang <niqingliang2003@gmail.com> Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>