dmaengine: ste_dma40: fix implicit conversion

The function d40_prep_sg takes the type enum dma_transfer_direction
as second last parameter. However, the memcpy calls pass DMA_NONE
which is of type enum dma_data_direction. Fix this by passing the
actual transfer direction DMA_MEM_TO_MEM.

This does not change the actual code flow since only the transfer
direction DMA_MEM_TO_DEV and DMA_DEV_TO_MEM are actually used in the
function d40_prep_sg.
Signed-off-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

drivers/dma/ste_dma40.c

@@ -2514,7 +2514,8 @@ static struct dma_async_tx_descriptor *d40_prep_memcpy(struct dma_chan *chan,
 	sg_dma_len(&dst_sg) = size;
 	sg_dma_len(&src_sg) = size;
 
-	return d40_prep_sg(chan, &src_sg, &dst_sg, 1, DMA_NONE, dma_flags);
+	return d40_prep_sg(chan, &src_sg, &dst_sg, 1,
+			   DMA_MEM_TO_MEM, dma_flags);
 }
 
 static struct dma_async_tx_descriptor *
@@ -2526,7 +2527,8 @@ d40_prep_memcpy_sg(struct dma_chan *chan,
 	if (dst_nents != src_nents)
 		return NULL;
 
-	return d40_prep_sg(chan, src_sg, dst_sg, src_nents, DMA_NONE, dma_flags);
+	return d40_prep_sg(chan, src_sg, dst_sg, src_nents,
+			   DMA_MEM_TO_MEM, dma_flags);
 }
 
 static struct dma_async_tx_descriptor *