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

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