scsi: elx: efct: Remove NULL check after calling container_of()

container_of() will never return NULL.

Link: https://lore.kernel.org/r/1652750737-22673-1-git-send-email-baihaowen@meizu.com
Signed-off-by: Haowen Bai <baihaowen@meizu.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>