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iommu/mediatek-v1: fix device leak on probe_device()

Make sure to drop the reference taken to the iommu platform device when
looking up its driver data during probe_device().

Fixes: b17336c55d89 ("iommu/mediatek: add support for mtk iommu generation one HW")
Cc: stable@vger.kernel.org # 4.8
Cc: Honghui Zhang <honghui.zhang@mediatek.com>
Acked-by: Robin Murphy <robin.murphy@arm.com>
Reviewed-by: Yong Wu <yong.wu@mediatek.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

authored by

Johan Hovold and committed by
Joerg Roedel c77ad28b 4f2a4aec

+2
+2
drivers/iommu/mtk_iommu_v1.c
··· 438 438 return -EINVAL; 439 439 440 440 dev_iommu_priv_set(dev, platform_get_drvdata(m4updev)); 441 + 442 + put_device(&m4updev->dev); 441 443 } 442 444 443 445 ret = iommu_fwspec_add_ids(dev, args->args, 1);