fix return values of l2tp_dfs_seq_open()

More fallout from struct net lifetime rules review: PTR_ERR() is *already*
negative and failing ->open() should return negatives on failure.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: James Chapman <jchapman@katalix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/l2tp/l2tp_debugfs.c

diff --git a/net/l2tp/l2tp_debugfs.c b/net/l2tp/l2tp_debugfs.c
index b8dbae8..7613013 100644
--- a/net/l2tp/l2tp_debugfs.c
+++ b/net/l2tp/l2tp_debugfs.c
@@ -258,7 +258,7 @@
 	 */
 	pd->net = get_net_ns_by_pid(current->pid);
 	if (IS_ERR(pd->net)) {
-		rc = -PTR_ERR(pd->net);
+		rc = PTR_ERR(pd->net);
 		goto err_free_pd;
 	}