virSecurityManagerMetadataLock: Skip over duplicate paths
If there are two paths on the list that are the same we need to lock it only once. Because when we try to lock it the second time then open() fails. And if it didn't, locking it the second time would fail for sure. After all, it is sufficient to lock all paths just once satisfy the caller.
Reported-by: Daniel Henrique Barboza <danielhb413 gmail com> Signed-off-by: Michal Privoznik <mprivozn redhat com> Reviewed-by: Daniel P. Berrangé <berrange redhat com> Tested-by: Daniel Henrique Barboza <danielhb413 gmail com>
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