[PATCH for 6.1] multifd: Unconditionally unregister yank function

[Lukas Straub <lukasstraub2@web.de>]

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Unconditionally unregister yank function in multifd_load_cleanup().
If it is not unregistered here, it will leak and cause a crash
in yank_unregister_instance(). Now if the ioc is still in use
afterwards, it will only lead to qemu not being able to recover
from a hang related to that ioc.

After checking the code, i am pretty sure that ref is always 1
when arriving here. So all this currently does is remove the
unneeded check.

Signed-off-by: Lukas Straub <lukasstraub2@web.de>
---

This is similar to Peter Xu's 
39675ffffb3394d44b880d083a214c5e44786170
"migration: Move the yank unregister of channel_close out"
in that it removes the "OBJECT(p->c)->ref == 1" hack. So it
makes sense for 6.1 so these patches are together.

 migration/multifd.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/migration/multifd.c b/migration/multifd.c
index 377da78f5b..a37805e17e 100644
--- a/migration/multifd.c
+++ b/migration/multifd.c
@@ -987,10 +987,7 @@ int multifd_load_cleanup(Error **errp)
     for (i = 0; i < migrate_multifd_channels(); i++) {
         MultiFDRecvParams *p = &multifd_recv_state->params[i];
 
-        if (OBJECT(p->c)->ref == 1) {
-            migration_ioc_unregister_yank(p->c);
-        }
-
+        migration_ioc_unregister_yank(p->c);
         object_unref(OBJECT(p->c));
         p->c = NULL;
         qemu_mutex_destroy(&p->mutex);
-- 
2.32.0

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