[media] tua9001: fix a warning
drivers/media/tuners/tua9001.c:211:5: warning: 'ret' may be used uninitialized in this function [-Wmaybe-uninitialized]
Cc: Antti Palosaari <crope@iki.fi>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>
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