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

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