TS-3859 Check the error result from pcre_study() correctly
TS-3859 Check the error result from pcre_study() correctly

On some platforms, e.g. CentOS6, it seems the pcre_study() doesn't
produce the "_extra" result. This is legitimate, but triggeres a
bug where we don't check the error result properly.

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