linux-phytec-fsl

iommu/amd: Remove an unneeded condition

get_device_id() returns an unsigned short device id.  It never fails and
it never returns a negative so we can remove this condition.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>