From 5116fbf136ea21b8678a85eee5c03508736ada9f Mon Sep 17 00:00:00 2001
From: James Smart <james.smart@avagotech.com>
Date: Fri, 22 May 2015 10:42:39 -0400
Subject: [PATCH] lpfc: Fix scsi prep dma buf error.

Didn't check for less-than-or-equal zero. Means we may later call
scsi_dma_unmap() even though we don't have valid mappings.

Signed-off-by: Dick Kennedy <dick.kennedy@avagotech.com>
Signed-off-by: James Smart <james.smart@avagotech.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: James Bottomley <JBottomley@Odin.com>
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Reading git-format-patch failed