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 04a8cad560fe25ae06be0cde144b5dfd9e8e3017..7bfcaadc74cc0fd411a6128173954dfc2f3c1197 100644 (file)
--- a/ripd/ripd.c
+++ b/ripd/ripd.c
@@ -3597,18 +3597,10 @@ 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;
 }