[media] rtl2830: prevent .read_status() when sleeping
Hardware is not accessible when device is sleeping. Preventing such IOCTLs when sleep should be job of DVB CORE... Signed-off-by: NAntti Palosaari <crope@iki.fi> Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>
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