fix sparc32 ->map_sg regression

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To: sparclinux@xxxxxxxxxxxxxxx
Subject: fix sparc32 ->map_sg regression
From: Christoph Hellwig <hch@xxxxxx>
Date: Sun, 16 Dec 2018 10:57:53 +0100
Cc: linux@xxxxxxxxxxxx

Thanks to Guenther for reporting and providing a qemu root image
to reproduce.

Follow-Ups:
- Re: fix sparc32 ->map_sg regression
  - From: Christoph Hellwig
- [PATCH 2/2] sparc/iommu: fix ->map_sg return value
  - From: Christoph Hellwig
- [PATCH 1/2] sparc/io-unit: fix ->map_sg return value
  - From: Christoph Hellwig

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