[media] tm6000: don't initialize static var on tm6000-i2c.c

This is a patch to the tm6000-i2c.c file that fixed "ERROR: do not
initialise statics to 0 or NULL" found by the checkpatch.pl tools.

Signed-off-by: Ruslan Pisarev <ruslan@rpisarev.org.ua>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>