driver: macvlan: Replace integer number with bool value

The return value of function macvlan_addr_busy is used as bool value,
so use bool value instead of integer number "1" and "0".
Signed-off-by: NGao Feng <gfree.wind@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/macvlan.c

@@ -179,20 +179,20 @@ static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
 	macvlan_hash_add(vlan);
 }
 
-static int macvlan_addr_busy(const struct macvlan_port *port,
-				const unsigned char *addr)
+static bool macvlan_addr_busy(const struct macvlan_port *port,
+			      const unsigned char *addr)
 {
 	/* Test to see if the specified multicast address is
 	 * currently in use by the underlying device or
 	 * another macvlan.
 	 */
 	if (ether_addr_equal_64bits(port->dev->dev_addr, addr))
-		return 1;
+		return true;
 
 	if (macvlan_hash_lookup(port, addr))
-		return 1;
+		return true;
 
-	return 0;
+	return false;
 }