[media] ngene: preventing dereferencing a NULL pointer
As reported by smatch:
drivers/media/pci/ngene/ngene-core.c:1529 init_channel() error: we previously assumed 'chan->fe' could be null (see line 1521)
Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>
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