In iscsi_target_init_module() unwind transport protocol registration in case
that iscsit_load_discovery_tpg() failed.
Signed-off-by: NLino Sanfilippo <LinoSanfilippo@gmx.de>
Reviewed-by: NSagi Grimberg <sagig@mellanox.com>
Signed-off-by: NNicholas Bellinger <nab@linux-iscsi.org>