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

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