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

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