From 15177608c703e7b4aa29aa7c93b31001effe504c Mon Sep 17 00:00:00 2001
From: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Date: Tue, 29 Oct 2013 00:37:37 +0000
Subject: [PATCH] swiotlb-xen: fix error code returned by
 xen_swiotlb_map_sg_attrs

map_sg returns the number of elements mapped, not a dma_addr_t.
In case of error return 0, not DMA_ERROR_CODE.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
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