6497353 bfu to an alternate root filesystem fails due to bug in ksh

[roger.faulk...@sun.com]

Author: raf
Repository: /hg/onnv/onnv-gate
Revision: 3950464db9a4671f86f1c34a43e9ea1650767274
Log message:
6497353 bfu to an alternate root filesystem fails due to bug in ksh

Files:
        update: usr/src/tools/scripts/bfu.sh