thunderbolt: Remove duplicated re-assignment of pointer 'out'

The pointer 'out' is initialized and then a few statements later being
re-assigned the same value. The second re-assignment is redundant and
can be removed.

Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>