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

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