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virFileResolveLink was returning a positive value on error, thus confusing callers that assumed failure was < 0. The confusion is further evidenced by callers that would have ended up calling virReportSystemError with a negative value instead of a valid errno. Fixes Red Hat BZ #591363. * src/util/util.c (virFileResolveLink): Live up to documentation. * src/qemu/qemu_security_dac.c (qemuSecurityDACRestoreSecurityFileLabel): Adjust callers. * src/security/security_selinux.c (SELinuxRestoreSecurityFileLabel): Likewise. * src/storage/storage_backend_disk.c (virStorageBackendDiskDeleteVol): Likewise.