iser-target: Remove impossible condition from isert_wait_conn

We can never get to isert_wait_conn in INIT state anymore, so
get rid of this condition.

Signed-off-by: Jenny Derzhavetz <jennyf@mellanox.com>
Signed-off-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>