scsi: lpfc: Fix a typo

Change 'lenth' to 'length'.

Link: https://lore.kernel.org/r/20210322075645.25636-1-samirweng1979@163.com


Acked-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: wengjianfeng <wengjianfeng@yulong.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>