Some code cleanup for GCC 4.x
diff --git a/drivers/smc91111.h b/drivers/smc91111.h
index cf08582..c3c3367 100644
--- a/drivers/smc91111.h
+++ b/drivers/smc91111.h
@@ -49,7 +49,7 @@
  * in order to override the default mac address.
  */
 
-void smc_set_mac_addr(const char *addr);
+void smc_set_mac_addr (const unsigned char *addr);
 
 
 /* I want some simple types */