dma-mapping: fix the prototype of dma_map_single()
Make dma_map_single() return the dma address, and remove the
pointless volatile.
Signed-off-by: NMasahiro Yamada <yamada.masahiro@socionext.com>
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Make dma_map_single() return the dma address, and remove the
pointless volatile.
Signed-off-by: NMasahiro Yamada <yamada.masahiro@socionext.com>