bfdd: tell peer when our control plane is dead

Simplify and fix the code that handles session teardown on control
plane shutdown (either failure or graceful).

- Don't move the `NULL` check inside `free` functions that expect
  data: it creates harder to understand flows.
- Add some new debug messages to aid visualizing session deletions.
- Add sanity check error message (if it ever happens).

Signed-off-by: Rafael Zalamena <rzalamena@opensourcerouting.org>

0 files changed, 0 insertions, 0 deletions