[TS-3294] Add null pointer check
[TS-3294] Add null pointer check

Coverity CID:1021866

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