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

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