qemu: block commit: Don't overwrite error when rolling back disk labels
Calls to qemuDomainDiskChainElementPrepare resets the original error, thus we need to save it in the cleanup path of qemuDomainBlockCommit.
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Calls to qemuDomainDiskChainElementPrepare resets the original error, thus we need to save it in the cleanup path of qemuDomainBlockCommit.