dmaengine: at_hdmac: remove unsuded atc_cleanup_descriptors()
Since patch 7c407d3e54dcc0c79119553c8d5ef176c1d5bc3a (DMA: AT91: Get residual bytes in dma buffer), the function atc_cleanup_descriptors() is not used anymore. We remove it to prevent warnings. Reported-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com> Acked-by: Arnd Bergmann <arnd@arndb.de>
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