TS-1475: fix clang warnings - init towrite to 0
TS-1475: fix clang warnings - init towrite to 0

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