Revert "ripngd: Cleanup memory allocations on shutdown"

This reverts commit b1d29673ca16e558aea5d632da181555c83980cf.

This commit introduced a crash. When the VRF is deleted, the RIPNG
instance should not be freed, because the NB infrastructure still stores
the pointer to it. The instance should be deleted only when it's actually
deleted from the configuration.

To reproduce the crash:
```
frr# conf t
frr(config)# vrf vrf1
frr(config-vrf)# exit
frr(config)# router ripng vrf vrf1
frr(config-router)# exit
frr(config)# no vrf vrf1
frr(config)# no router ripng vrf vrf1
vtysh: error reading from ripngd: Resource temporarily unavailable (11)Warning: closing connection to ripngd because of an I/O error!
frr(config)#
```

Signed-off-by: Igor Ryzhov <iryzhov@nfware.com>
(cherry picked from commit 9f6dade90e5e4686f67ae17b42c2873ec7ca6532)

diff --git a/ripngd/ripngd.c b/ripngd/ripngd.c
index 755debd0a4ec7a0a00e0366b9732bd56a45ff876..1e7a13d7dc61e1f2d03a8257c37f1f8c13e3e936 100644 (file)
--- a/ripngd/ripngd.c
+++ b/ripngd/ripngd.c
@@ -2581,17 +2581,10 @@ static int ripng_vrf_new(struct vrf *vrf)
 
 static int ripng_vrf_delete(struct vrf *vrf)
 {
-       struct ripng *ripng;
-
        if (IS_RIPNG_DEBUG_EVENT)
                zlog_debug("%s: VRF deleted: %s(%u)", __func__, vrf->name,
                           vrf->vrf_id);
 
-       ripng = ripng_lookup_by_vrf_name(vrf->name);
-       if (!ripng)
-               return 0;
-
-       ripng_clean(ripng);
        return 0;
 }