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由 John Ferlan 提交于
Since virStorageVolFree will call virObjectUnref anyway, let's just use that directly so as to avoid the possibility that we inadvertently clear out a pending error message when using the public API.
d1219054
Since virStorageVolFree will call virObjectUnref anyway, let's just use that directly so as to avoid the possibility that we inadvertently clear out a pending error message when using the public API.