V4L/DVB (6584): Fix read() method
Backport read() fixes from Markus Rechberger.
Signed-off-by: NMauro Carvalho Chehab <mchehab@infradead.org>
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Backport read() fixes from Markus Rechberger.
Signed-off-by: NMauro Carvalho Chehab <mchehab@infradead.org>