scsi: target: iscsi: Make sure the np under each tpg is unique

stable inclusion
from stable-v5.10.101
commit 7dbda616fc64298cedfb5b6cd52049f8038234fb
bugzilla: https://gitee.com/openeuler/kernel/issues/I5669Z

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=7dbda616fc64298cedfb5b6cd52049f8038234fb

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[ Upstream commit a861790a ]

iscsit_tpg_check_network_portal() has nested for_each loops and is supposed
to return true when a match is found. However, the tpg loop will still
continue after existing the tpg_np loop. If this tpg_np is not the last the
match value will be changed.

Break the outer loop after finding a match and make sure the np under each
tpg is unique.

Link: https://lore.kernel.org/r/20220111054742.19582-1-mingzhe.zou@easystack.cn


Signed-off-by: ZouMingzhe <mingzhe.zou@easystack.cn>
Reviewed-by: Mike Christie <michael.christie@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Yu Liao <liaoyu15@huawei.com>
Reviewed-by: Wei Li <liwei391@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>