Fix a complie warning in ws_dfu
Fix a complie warning in ws_dfu

Signed-off-by: Kevin Wang <89466e00bf73c4e3ac91872f07418bebdb43918d@lexisnexis.com>

afishbeck/HPCC-Platform,afishbeck/HPCC-Platform,afishbeck/HPCC-Platform,afishbeck/HPCC-Platform,afishbeck/HPCC-Platform,afishbeck/HPCC-Platform