miiphy: constify device name

The driver name does not need to be writable, so constify it.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Ben Warren <biggerbadderben@gmail.com>
diff --git a/drivers/net/eepro100.c b/drivers/net/eepro100.c
index 9c06b25..5cb767a 100644
--- a/drivers/net/eepro100.c
+++ b/drivers/net/eepro100.c
@@ -350,7 +350,7 @@
 	return dev;
 }
 
-static int eepro100_miiphy_read (char *devname, unsigned char addr,
+static int eepro100_miiphy_read(const char *devname, unsigned char addr,
 		unsigned char reg, unsigned short *value)
 {
 	struct eth_device *dev;
@@ -367,7 +367,7 @@
 	return 0;
 }
 
-static int eepro100_miiphy_write (char *devname, unsigned char addr,
+static int eepro100_miiphy_write(const char *devname, unsigned char addr,
 		unsigned char reg, unsigned short value)
 {
 	struct eth_device *dev;