serial: sh-sci: Use DMA submission helpers instead of open-coding
Replace open-coded - calls to dma_async_tx_descriptor.tx_submit() by calls to the dmaengine_submit() helper, - dma_cookie_t comparisons by calls to dma_submit_error(). Signed-off-by: NGeert Uytterhoeven <geert+renesas@glider.be> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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