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

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