media: tda18271: remove redundant assignment to variable bcal

The variable bcal is being initialized with a value that is never
read, it is being re-assigned in both paths of an if statement near
the end of the function. The initialization is redundant and can
be removed.

Cleans up clang scan build warning:
drivers/media/tuners/tda18271-fe.c:473:2: warning: Value stored
to 'bcal' is never read [deadcode.DeadStores]

Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>