pimd: Fix wrong protocol for SSM

Consider LHR in `SSM` case, and its `oif` goes from up to down.
As the `oif` changes down, the `channel_oil` is still wrongly reserved
with `PIM_OIF_FLAG_PROTO_STAR` protocol.

The mechanism of adding `STAR` protocol for <S,G> entry without `oif`
is introduced by commit `2164ed5`, which should be only used for ASM.

PR #13699 wants to clean this `STAR` protocol after the `oif` becomes up
again. That case is for SSM, as the `oif` changes down, the `channel_oil`
should be removed, so the fix of that PR is wrong.

In `pim_ifchannel_delete()` we should check the `ch->parent` before that
mechanism of adding `STAR` protocol. If `ch->parent` is NULL, we should
skip that mechanism with SSM.

Fixes #13696

Signed-off-by: anlan_cs <vic.lan@pica8.com>

0 files changed, 0 insertions, 0 deletions