ARM: Convert to devm_ioremap_resource()

Convert all uses of devm_request_and_ioremap() to the newly introduced
devm_ioremap_resource() which provides more consistent error handling.

Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
Cc: Russell King <linux@arm.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/arch/arm/plat-omap/dmtimer.c b/arch/arm/plat-omap/dmtimer.c
index 7b433f3..a0daa2f 100644
--- a/arch/arm/plat-omap/dmtimer.c
+++ b/arch/arm/plat-omap/dmtimer.c
@@ -808,11 +808,9 @@
 		return  -ENOMEM;
 	}
 
-	timer->io_base = devm_request_and_ioremap(dev, mem);
-	if (!timer->io_base) {
-		dev_err(dev, "%s: region already claimed.\n", __func__);
-		return -ENOMEM;
-	}
+	timer->io_base = devm_ioremap_resource(dev, mem);
+	if (IS_ERR(timer->io_base))
+		return PTR_ERR(timer->io_base);
 
 	if (dev->of_node) {
 		if (of_find_property(dev->of_node, "ti,timer-alwon", NULL))