spi_s3c24xx: use resource_size() to get resource size

Change the use of (res->end - res->start) to use resource_size() to
get the size of the resource.

Signed-off-by; Ben Dooks <ben@simtec.co.uk>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

drivers/spi/spi_s3c24xx.c

@@ -299,7 +299,7 @@ static int __init s3c24xx_spi_probe(struct platform_device *pdev)
 		goto err_no_iores;
 	}
 
-	hw->ioarea = request_mem_region(res->start, (res->end - res->start)+1,
+	hw->ioarea = request_mem_region(res->start, resource_size(res),
 					pdev->name);
 
 	if (hw->ioarea == NULL) {
@@ -308,7 +308,7 @@ static int __init s3c24xx_spi_probe(struct platform_device *pdev)
 		goto err_no_iores;
 	}
 
-	hw->regs = ioremap(res->start, (res->end - res->start)+1);
+	hw->regs = ioremap(res->start, resource_size(res));
 	if (hw->regs == NULL) {
 		dev_err(&pdev->dev, "Cannot map IO\n");
 		err = -ENXIO;