can: ti_hecc: ti_hecc_start(): avoid multiple assignments

This patch changes the multiple assignments of HECC_TX_MASK in
ti_hecc_start() into two single ones.
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

drivers/net/can/ti_hecc.c

@@ -364,7 +364,8 @@ static void ti_hecc_start(struct net_device *ndev)
 	/* put HECC in initialization mode and set btc */
 	ti_hecc_reset(ndev);
 
-	priv->tx_head = priv->tx_tail = HECC_TX_MASK;
+	priv->tx_head = HECC_TX_MASK;
+	priv->tx_tail = HECC_TX_MASK;
 
 	/* Enable local and global acceptance mask registers */
 	hecc_write(priv, HECC_CANGAM, HECC_SET_REG);