dmaengine: dw-axi-dmac: 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/20260108105619.3513561-6-andriy.shevchenko@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

Author: andy-shev

drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c

@@ -850,7 +850,7 @@ dw_axi_dma_chan_prep_slave_sg(struct dma_chan *dchan, struct scatterlist *sgl,
 	unsigned int loop = 0;
 	struct scatterlist *sg;
 	size_t axi_block_len;
-	u32 len, num_sgs = 0;
+	u32 len, num_sgs;
 	unsigned int i;
 	dma_addr_t mem;
 	int status;
@@ -867,9 +867,7 @@ dw_axi_dma_chan_prep_slave_sg(struct dma_chan *dchan, struct scatterlist *sgl,
 	if (axi_block_len == 0)
 		return NULL;
 
-	for_each_sg(sgl, sg, sg_len, i)
-		num_sgs += DIV_ROUND_UP(sg_dma_len(sg), axi_block_len);
-
+	num_sgs = sg_nents_for_dma(sgl, sg_len, axi_block_len);
 	desc = axi_desc_alloc(num_sgs);
 	if (unlikely(!desc))
 		goto err_desc_get;