Revert "ripd: Cleanup memory allocations on shutdown"

This reverts commit 3d1588d8ed537e3dbf120e1b2a5ad5b3c00c7897.

This commit introduced a crash. When the VRF is deleted, the RIP 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 rip vrf vrf1
frr(config-router)# exit
frr(config)# no vrf vrf1
frr(config)# no router rip vrf vrf1
vtysh: error reading from ripd: Resource temporarily unavailable (11)Warning: closing connection to ripd because of an I/O error!
frr(config)#
```

Signed-off-by: Igor Ryzhov <iryzhov@nfware.com>
(cherry picked from commit 054ca9b9ee760e23ac5d9f8d26d50e8fca78a887)

diff --git a/ripd/ripd.c b/ripd/ripd.c
index 8e02f1a6c18589a7d9387770de6c0d52cfcffcb0..8a321d9a91f38ed1dc8c25dc811a2bc9d32f638e 100644 (file)
--- a/ripd/ripd.c
+++ b/ripd/ripd.c
@@ -3551,18 +3551,10 @@ static int rip_vrf_new(struct vrf *vrf)
 
 static int rip_vrf_delete(struct vrf *vrf)
 {
-       struct rip *rip;
-
        if (IS_RIP_DEBUG_EVENT)
                zlog_debug("%s: VRF deleted: %s(%u)", __func__, vrf->name,
                           vrf->vrf_id);
 
-       rip = rip_lookup_by_vrf_name(vrf->name);
-       if (!rip)
-               return 0;
-
-       rip_clean(rip);
-
        return 0;
 }