bfd: use local error index when incrementing node counters

bfd: use local error index when incrementing node counters

When incrementing node counters with vlib_node_increment_counter
the local error index should be passed in. vlib_node_increment_counter
adds the local index to the nodes base index to get the counter to
write to. If we pass in the global counter index, the offset gets
added again in the fn, and we then potentially write into memory that
is not part of the counter vector.

Type: fix
Signed-off-by: Paul Atkins <patkins@graphiant.com>
Change-Id: I43be33a51bcb52d520495d326b971c1d848d96b5