ARM: dma-mapping: NULLify dev->archdata.mapping pointer on detach
The current code only clobbers a local variable, so the device is left with a stale mapping pointer. Cc: Hiroshi Doyu <hdoyu@nvidia.com> Signed-off-by: Will Deacon <will.deacon@arm.com> Acked-by: Hiroshi Doyu <hdoyu@nvidia.com> Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
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