of: Request and map make argument name constant

This patch makes the name argument from of_io_request_and_map constant.

Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>
Signed-off-by: Grant Likely <grant.likely@linaro.org>
diff --git a/drivers/of/address.c b/drivers/of/address.c
index afdb782..e02828f 100644
--- a/drivers/of/address.c
+++ b/drivers/of/address.c
@@ -871,7 +871,7 @@
  *		return PTR_ERR(base);
  */
 void __iomem *of_io_request_and_map(struct device_node *np, int index,
-					char *name)
+					const char *name)
 {
 	struct resource res;
 	void __iomem *mem;