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/mcfmii.c b/drivers/net/mcfmii.c
index 060bdd7..401182d 100644
--- a/drivers/net/mcfmii.c
+++ b/drivers/net/mcfmii.c
@@ -293,7 +293,7 @@
  *	  Otherwise they hang in mii_send() !!! Sorry!
  */
 
-int mcffec_miiphy_read(char *devname, unsigned char addr, unsigned char reg,
+int mcffec_miiphy_read(const char *devname, unsigned char addr, unsigned char reg,
 		       unsigned short *value)
 {
 	short rdreg;		/* register working value */
@@ -312,7 +312,7 @@
 	return 0;
 }
 
-int mcffec_miiphy_write(char *devname, unsigned char addr, unsigned char reg,
+int mcffec_miiphy_write(const char *devname, unsigned char addr, unsigned char reg,
 			unsigned short value)
 {
 	short rdreg;		/* register working value */