dmaengine: sprd: statify 'sprd_dma_prep_dma_memcpy'
Sparse warns that 'sprd_dma_prep_dma_memcpy' should be static so make it static. drivers/dma/sprd-dma.c:713:32: warning: symbol'sprd_dma_prep_dma_memcpy' was not declared. Should it be static? Reviewed-by: NBaolin Wang <baolin.wang@linaro.org> Signed-off-by: NVinod Koul <vinod.koul@intel.com>
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