[libvirt] storage_backend_fs.c Bug

Line 1133 of storage_backend_fs.c in 0.6.0: if (vol->target.backingStore != NULL) { virStorageReportError(conn, VIR_ERR_NO_SUPPORT, _("copy-on-write image not supported with " "qcow-create")); return -1; } virStorageVolTarget has no member called backingStore, resulting in compile errors.