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

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