net/ipv6: convert skip_notify_on_dev_down sysctl to u8

Save a bit a space, and could help future sysctls to
use the same pattern.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Acked-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

include/net/netns/ipv6.h

@@ -53,7 +53,7 @@ struct netns_sysctl_ipv6 {
 	int seg6_flowlabel;
 	u32 ioam6_id;
 	u64 ioam6_id_wide;
-	int skip_notify_on_dev_down;
+	u8 skip_notify_on_dev_down;
 	u8 fib_notify_on_flag_change;
 	u8 icmpv6_error_anycast_as_unicast;
 };

net/ipv6/route.c

@@ -6412,9 +6412,9 @@ static struct ctl_table ipv6_route_table_template[] = {
 	{
 		.procname	=	"skip_notify_on_dev_down",
 		.data		=	&init_net.ipv6.sysctl.skip_notify_on_dev_down,
-		.maxlen		=	sizeof(int),
+		.maxlen		=	sizeof(u8),
 		.mode		=	0644,
-		.proc_handler	=	proc_dointvec_minmax,
+		.proc_handler	=	proc_dou8vec_minmax,
 		.extra1		=	SYSCTL_ZERO,
 		.extra2		=	SYSCTL_ONE,
 	},