mrf24j40: remove unnecessary return statement

Remove the return statement in the void function.

Signed-off-by: Varka Bhadram <varkab@cdac.in>
Acked-by: Alan Ott <alan@signal11.us>
Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

drivers/net/ieee802154/mrf24j40.c

@@ -420,8 +420,6 @@ static void mrf24j40_stop(struct ieee802154_dev *dev)
 		return;
 	val |= 0x1|0x8; /* Set TXNIE and RXIE. Disable Interrupts */
 	write_short_reg(devrec, REG_INTCON, val);
-
-	return;
 }
 
 static int mrf24j40_set_channel(struct ieee802154_dev *dev,