net sysctl: Initialize the network sysctls sooner to avoid problems.

If the netfilter code is modified to use register_net_sysctl_table the
kernel fails to boot because the per net sysctl infrasturce is not setup
soon enough.  So to avoid races call net_sysctl_init from sock_init().

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Acked-by: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/socket.c

@@ -2524,6 +2524,12 @@ EXPORT_SYMBOL(sock_unregister);
 static int __init sock_init(void)
 {
 	int err;
+	/*
+	 *      Initialize the network sysctl infrastructure.
+	 */
+	err = net_sysctl_init();
+	if (err)
+		goto out;
 
 	/*
 	 *      Initialize sock SLAB cache.