[media] timblogiw: too large value for strncpy()

This is a copy and paste error.  It should be using sizeof(cap->driver)
instead of sizeof(cap->card).

Signed-off-by: Dan Carpenter <error27@gmail.com>
Cc: Richard Rojförs <richard.rojfors@pelagicore.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>