mfd: Use resouce_size for tc6393xb

Use resource_size() for ioremap.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Molton <ian@mnementh.co.uk>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

drivers/mfd/tc6393xb.c

@@ -647,7 +647,7 @@ static int __devinit tc6393xb_probe(struct platform_device *dev)
 	if (ret)
 		goto err_request_scr;
 
-	tc6393xb->scr = ioremap(rscr->start, rscr->end - rscr->start + 1);
+	tc6393xb->scr = ioremap(rscr->start, resource_size(rscr));
 	if (!tc6393xb->scr) {
 		ret = -ENOMEM;
 		goto err_ioremap;