Do not overflow kernel memory when more than BT878_MAX devices are 
present.
Signed-off-by: NSigmund Augdal Helberg <sigmund@snap.tv>
Signed-off-by: NManu Abraham <manu@linuxtv.org>
Signed-off-by: NMauro Carvalho Chehab <mchehab@infradead.org>