dmaengine: pxa-dma: 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/20260108105619.3513561-9-andriy.shevchenko@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

Author: andy-shev

drivers/dma/pxa_dma.c

@@ -970,7 +970,7 @@ pxad_prep_slave_sg(struct dma_chan *dchan, struct scatterlist *sgl,
 	struct scatterlist *sg;
 	dma_addr_t dma;
 	u32 dcmd, dsadr = 0, dtadr = 0;
-	unsigned int nb_desc = 0, i, j = 0;
+	unsigned int nb_desc, i, j = 0;
 
 	if ((sgl == NULL) || (sg_len == 0))
 		return NULL;
@@ -979,8 +979,7 @@ pxad_prep_slave_sg(struct dma_chan *dchan, struct scatterlist *sgl,
 	dev_dbg(&chan->vc.chan.dev->device,
 		"%s(): dir=%d flags=%lx\n", __func__, dir, flags);
 
-	for_each_sg(sgl, sg, sg_len, i)
-		nb_desc += DIV_ROUND_UP(sg_dma_len(sg), PDMA_MAX_DESC_BYTES);
+	nb_desc = sg_nents_for_dma(sgl, sg_len, PDMA_MAX_DESC_BYTES);
 	sw_desc = pxad_alloc_desc(chan, nb_desc + 1);
 	if (!sw_desc)
 		return NULL;