TS-1475: fix clang warning
TS-1475: fix clang warning

chenglongwei/trafficserver,persiaAziz/trafficserver,chenglongwei/trafficserver,reveller/trafficserver,reveller/trafficserver,rahmalik/trafficserver,dyrock/trafficserver,chenglongwei/trafficserver,rpufky/trafficserver,clearswift/trafficserver,vmamidi/trafficserver,chenglongwei/trafficserver,clearswift/trafficserver,SolidWallOfCode/trafficserver,chenglongwei/trafficserver,rahmalik/trafficserver,bryancall/trafficserver,pbchou/trafficserver,reveller/trafficserver,vmamidi/trafficserver,PSUdaemon/trafficserver,persiaAziz/trafficserver,duke8253/trafficserver,PSUdaemon/trafficserver,persiaAziz/trafficserver,chitianhao/trafficserver,taoyunxing/trafficserver,dyrock/trafficserver,chenglongwei/trafficserver,taoyunxing/trafficserver,duke8253/trafficserver,rpufky/trafficserver,rpufky/trafficserver,rahmalik/trafficserver,bryancall/trafficserver,clearswift/trafficserver,SolidWallOfCode/trafficserver,PSUdaemon/trafficserver,reveller/trafficserver,chenglongwei/trafficserver,PSUdaemon/trafficserver,pbchou/trafficserver,chitianhao/trafficserver,davidbz/trafficserver,rpufky/trafficserver,davidbz/trafficserver,duke8253/trafficserver,chitianhao/trafficserver,bryancall/trafficserver,vmamidi/trafficserver,bryancall/trafficserver,taoyunxing/trafficserver,rahmalik/trafficserver,SolidWallOfCode/trafficserver,pbchou/trafficserver,clearswift/trafficserver,rahmalik/trafficserver,rpufky/trafficserver,reveller/trafficserver,duke8253/trafficserver,reveller/trafficserver,persiaAziz/trafficserver,persiaAziz/trafficserver,PSUdaemon/trafficserver,PSUdaemon/trafficserver,vmamidi/trafficserver,reveller/trafficserver,chitianhao/trafficserver,SolidWallOfCode/trafficserver,taoyunxing/trafficserver,taoyunxing/trafficserver,dyrock/trafficserver,SolidWallOfCode/trafficserver,rahmalik/trafficserver,persiaAziz/trafficserver,dyrock/trafficserver,taoyunxing/trafficserver,pbchou/trafficserver,pbchou/trafficserver,SolidWallOfCode/trafficserver,rpufky/trafficserver,clearswift/trafficserver,clearswift/trafficserver,rpufky/trafficserver,rahmalik/trafficserver,davidbz/trafficserver,reveller/trafficserver,bryancall/trafficserver,bryancall/trafficserver,dyrock/trafficserver,duke8253/trafficserver,PSUdaemon/trafficserver,rpufky/trafficserver,persiaAziz/trafficserver,chitianhao/trafficserver,clearswift/trafficserver,chenglongwei/trafficserver,davidbz/trafficserver,davidbz/trafficserver,rahmalik/trafficserver,rahmalik/trafficserver,chitianhao/trafficserver,chitianhao/trafficserver,PSUdaemon/trafficserver,vmamidi/trafficserver,pbchou/trafficserver,PSUdaemon/trafficserver,dyrock/trafficserver,taoyunxing/trafficserver,duke8253/trafficserver,taoyunxing/trafficserver,duke8253/trafficserver,reveller/trafficserver,rpufky/trafficserver,persiaAziz/trafficserver,dyrock/trafficserver,clearswift/trafficserver,SolidWallOfCode/trafficserver,clearswift/trafficserver,davidbz/trafficserver,vmamidi/trafficserver,taoyunxing/trafficserver