net: Drop pernet_operations::async

Synchronous pernet_operations are not allowed anymore.
All are asynchronous. So, drop the structure member.

Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/netfilter/ipvs/ip_vs_core.c

@@ -2289,12 +2289,10 @@ static struct pernet_operations ipvs_core_ops = {
 	.exit = __ip_vs_cleanup,
 	.id   = &ip_vs_net_id,
 	.size = sizeof(struct netns_ipvs),
-	.async = true,
 };
 
 static struct pernet_operations ipvs_core_dev_ops = {
 	.exit = __ip_vs_dev_cleanup,
-	.async = true,
 };
 
 /*

net/netfilter/ipvs/ip_vs_ftp.c

@@ -479,7 +479,6 @@ static void __ip_vs_ftp_exit(struct net *net)
 static struct pernet_operations ip_vs_ftp_ops = {
 	.init = __ip_vs_ftp_init,
 	.exit = __ip_vs_ftp_exit,
-	.async = true,
 };
 
 static int __init ip_vs_ftp_init(void)

net/netfilter/ipvs/ip_vs_lblc.c

@@ -604,7 +604,6 @@ static void __net_exit __ip_vs_lblc_exit(struct net *net) { }
 static struct pernet_operations ip_vs_lblc_ops = {
 	.init = __ip_vs_lblc_init,
 	.exit = __ip_vs_lblc_exit,
-	.async = true,
 };
 
 static int __init ip_vs_lblc_init(void)

net/netfilter/ipvs/ip_vs_lblcr.c

@@ -789,7 +789,6 @@ static void __net_exit __ip_vs_lblcr_exit(struct net *net) { }
 static struct pernet_operations ip_vs_lblcr_ops = {
 	.init = __ip_vs_lblcr_init,
 	.exit = __ip_vs_lblcr_exit,
-	.async = true,
 };
 
 static int __init ip_vs_lblcr_init(void)