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Commit cfd62c1 was incomplete; I found more cases where error messages were being overwritten, and where the code between the three registration/deregistration APIs was not consistent. Since it is fairly easy to trigger an attempt to deregister an unregistered object through public API, I also changed the error message from VIR_ERR_INTERNAL_ERROR to VIR_ERR_INVALID_ARG. * src/conf/object_event.c (virObjectEventCallbackListEventID): Inline... (virObjectEventStateEventID): ...into lone caller, and report error on failure. (virObjectEventCallbackListAddID, virObjectEventStateCallbackID) (virObjectEventCallbackListRemoveID) (virObjectEventCallbackListMarkDeleteID): Tweak error category. * src/remote/remote_driver.c (remoteConnectDomainEventRegister): Don't leak registration on failure. (remoteConnectDomainEventDeregisterAny) (remoteConnectNetworkEventDeregisterAny): Don't overwrite error. Signed-off-by: Eric Blake <eblake@redhat.com>