scsi: lpfc: Use sg_dma_len() API to get struct scatterlist's length

The sg_dma_len() API should be used to retrieve a scatterlist's length
instead of directly accessing scatterlist->length.

Signed-off-by: Justin Tee <justin.tee@broadcom.com>
Link: https://lore.kernel.org/r/20240131185112.149731-4-justintee8345@gmail.com


Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>