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

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