Fix a build issue that use of undeclared variables
Fix a build issue that use of undeclared variables

PR-1426 causes build error on some platforms which doesn't support congestion control.

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