scsi: lpfc: Use kcalloc()

Use kcalloc() instead of kmalloc() + memset().

Link: https://lore.kernel.org/r/20220313141847.109804-1-Julia.Lawall@inria.fr


Suggested-by: Joe Perches <joe@perches.com>
Signed-off-by: Julia Lawall <Julia.Lawall@inria.fr>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>