qemu: snapshot: go through cleanup on error
A recent commit added an error check for too-nested backing chains followed by a return, even though errors above jump to cleanup. Signed-off-by: NJán Tomko <jtomko@redhat.com> Fixes: b168fa88Reviewed-by: NDaniel P. Berrangé <berrange@redhat.com> Reviewed-by: NAndrea Bolognani <abologna@redhat.com>
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