net:ipv6:Remove unneeded semicolon

Eliminate the following coccinelle check warning:
net/ipv6/seg6.c:381:2-3
Reported-by: NZeal Robot <zealci@zte.com.cn>
Signed-off-by: NZhang Mingyu <zhang.mingyu@zte.com.cn>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipv6/seg6.c

@@ -378,7 +378,7 @@ static int __net_init seg6_net_init(struct net *net)
 		kfree(rcu_dereference_raw(sdata->tun_src));
 		kfree(sdata);
 		return -ENOMEM;
-	};
+	}
 #endif
 
 	return 0;