SCSI: spfc: fix typo of last_cmsn

Ramaxel inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I4I0OZ


CVE: NA

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Fix typo of last_cmsn which should be last_pmsn

Signed-off-by: Yanling Song <songyl@ramaxel.com>
Reviewed-by: Zhang <Lei&lt;zhanglei48@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>