dmaengine: xilinx: xdma: use sg_nents_for_dma() helper

Instead of open coded variant let's use recently introduced helper.

Reviewed-by: Bjorn Andersson <andersson@kernel.org>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://patch.msgid.link/20260108105619.3513561-14-andriy.shevchenko@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

Author: andy-shev

drivers/dma/xilinx/xdma.c

@@ -605,13 +605,11 @@ xdma_prep_device_sg(struct dma_chan *chan, struct scatterlist *sgl,
 	struct xdma_chan *xdma_chan = to_xdma_chan(chan);
 	struct dma_async_tx_descriptor *tx_desc;
 	struct xdma_desc *sw_desc;
-	u32 desc_num = 0, i;
 	u64 addr, dev_addr, *src, *dst;
+	u32 desc_num, i;
 	struct scatterlist *sg;
 
-	for_each_sg(sgl, sg, sg_len, i)
-		desc_num += DIV_ROUND_UP(sg_dma_len(sg), XDMA_DESC_BLEN_MAX);
-
+	desc_num = sg_nents_for_dma(sgl, sg_len, XDMA_DESC_BLEN_MAX);
 	sw_desc = xdma_alloc_desc(xdma_chan, desc_num, false);
 	if (!sw_desc)
 		return NULL;