openvswitch: Add Kconfig dependency on GRE-DEMUX.

Openvswitch uses function from NET_IPGRE_DEMUX module.
Add Kconfig dependency to fix following compilation errors:
http://marc.info/?l=linux-netdev&m=137244035226634

CC: Jesse Gross <jesse@nicira.com>
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Pravin Shelar <pshelar@nicira.com>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Acked-by: Jesse Gross <jesse@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 1 deletions

diff --git a/net/openvswitch/vport.c b/net/openvswitch/vport.c
index ba81294219ac..d4c7fa04ce08 100644
--- a/net/openvswitch/vport.c
+++ b/net/openvswitch/vport.c
@@ -39,7 +39,7 @@ static const struct vport_ops *vport_ops_list[] = {
         &ovs_netdev_vport_ops,
         &ovs_internal_vport_ops,
 
-#if IS_ENABLED(CONFIG_NET_IPGRE_DEMUX)
+#ifdef CONFIG_OPENVSWITCH_GRE
         &ovs_gre_vport_ops,
 #endif
 };