DMA: PL330: Fix build warning

This patch adds to fix the build warning as following.

drivers/dma/pl330.c: In function 'pl330_probe':
drivers/dma/pl330.c:859: warning: comparison of distinct pointer types lacks a cast
Signed-off-by: NBoojin Kim <boojin.kim@samsung.com>
Signed-off-by: NVinod Koul <vinod.koul@linux.intel.com>

drivers/dma/pl330.c

@@ -856,7 +856,8 @@ pl330_probe(struct amba_device *adev, const struct amba_id *id)
 	INIT_LIST_HEAD(&pd->channels);
 
 	/* Initialize channel parameters */
-	num_chan = max(pdat ? pdat->nr_valid_peri : 0, (u8)pi->pcfg.num_chan);
+	num_chan = max(pdat ? (int)pdat->nr_valid_peri : 0,
+					(int)pi->pcfg.num_chan);
 	pdmac->peripherals = kzalloc(num_chan * sizeof(*pch), GFP_KERNEL);
 
 	for (i = 0; i < num_chan; i++) {