staging: et131x: Fix 'else is not generally useful after a break or return'

Fix this checkpatch warning:

WARNING: else is not generally useful after a break or return
Signed-off-by: Mark Einon <mark.einon@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/et131x/et131x.c

@@ -1529,8 +1529,8 @@ static int et131x_mdio_read(struct mii_bus *bus, int phy_addr, int reg)
 
 	if (ret < 0)
 		return ret;
-	else
-		return value;
+
+	return value;
 }
 
 static int et131x_mdio_write(struct mii_bus *bus, int phy_addr,