rt_frtchord: fixed inconsistent ring
rt_frtchord: fixed inconsistent ring

when nodes died, sometimes the resulting ring after periodic stabilization was
inconsistent. this happened due to wrong adjacent finger pointers.

l4u/scalaris-mirror,l4u/scalaris-mirror,l4u/scalaris-mirror,l4u/scalaris-mirror,l4u/scalaris-mirror,l4u/scalaris-mirror