migration: Fix multifd crash on channel disorders

Peter Xurequested to merge
peterx/qemu-kvm:multifd-channels into c9s

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2169732

This patchset fixes multifd channel disorder on establishment which can cause qemu crash.

Signed-off-by: Peter Xu peterx@redhat.com

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