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

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