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

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