net: bridge: fix an inconsistent indentation

Smatch complains:
net/bridge/br_netlink_tunnel.c:
   318 br_process_vlan_tunnel_info() warn: inconsistent indenting

Fix it with a proper indenting

Signed-off-by: Chen Hanxiao <chenhx.fnst@fujitsu.com>
Acked-by: Nikolay Aleksandrov <razor@blackwall.org>
Signed-off-by: David S. Miller <davem@davemloft.net>