linux-phytec-fsl

iser-target: Fix sparse warning

isert_debug_level should be static, hence no need
to initialize it.

Reported-by: Shachar Raindel <raindel@mellanox.com>
Signed-off-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>