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

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