net: mii: Fix changes made by spatch

Some of the changes were a bit too complex.

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

board/gdsys/405ex/io64.c

@@ -264,8 +264,7 @@ int last_stage_init(void)
 		putc(slash[k % 8]);
 	}
 
-	int retval;
-	struct mii_dev *mdiodev = mdio_alloc();
+	mdiodev = mdio_alloc();
 	if (!mdiodev)
 		return -ENOMEM;
 	strncpy(mdiodev->name, CONFIG_SYS_GBIT_MII1_BUSNAME, MDIO_NAME_LEN);