ipv6: fix indentation of a config attribute

Fix indentation of a type attribute of IPV6_VTI config entry.
Signed-off-by: Prasad Pandit <pjp@fedoraproject.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv6/Kconfig

@@ -152,7 +152,7 @@ config INET6_TUNNEL
 	default n
 
 config IPV6_VTI
-tristate "Virtual (secure) IPv6: tunneling"
+	tristate "Virtual (secure) IPv6: tunneling"
 	select IPV6_TUNNEL
 	select NET_IP_TUNNEL
 	select XFRM