ipvlan: Fix a typo in a comment

s/diffentiate/differentiate/

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Author: tititiou36

drivers/net/ipvlan/ipvlan_main.c

@@ -601,7 +601,7 @@ int ipvlan_link_new(struct net *src_net, struct net_device *dev,
 		port->dev_id_start = 0x1;
 
 	/* Since L2 address is shared among all IPvlan slaves including
-	 * master, use unique 16 bit dev-ids to diffentiate among them.
+	 * master, use unique 16 bit dev-ids to differentiate among them.
 	 * Assign IDs between 0x1 and 0xFFFE (used by the master) to each
 	 * slave link [see addrconf_ifid_eui48()].
 	 */