ofproto-dpif: fix bundle_move() call in rstp_run().

bundle_move() expects two struct ofbundle pointers as arguments, but
void pointers hide the error.

Signed-off-by: Daniele Venturino <daniele.venturino@m3s.it>
Acked-by: Jarno Rajahalme <jrajahalme@nicira.com>