Ported r2585 from ZXing
Ported r2585 from ZXing

Original commit message: "Avoid stack overflow in some odd case in
multiple barcode detection, and don't use multiple threads for one image
on the command line"

Kalvar/ZXingObjC,zilaiyedaren/ZXingObjC,YotrolZ/ZXingObjC,SinnerSchraderMobileMirrors/ZXingObjC,jebai0521/ZXingObjC,tejesh-alimilli/ZXingObjC,zeffon/ZXingObjC,Kalvar/ZXingObjC,benjohnde/ZXingObjC,wuxsoft/ZXingObjC,ufs-slizhik/ZXingObjC,YotrolZ/ZXingObjC,elegion/ios-pods-ZXingObjC,SinnerSchraderMobileMirrors/ZXingObjC,trsathya/ZXingObjC,Stocard/ZXingObjC,JeremyPacker/ZXingObjC,xuxubin/ZXingObjC,rkpant/ZXingObjC,SinnerSchraderMobileMirrors/ZXingObjC,fanwenkai/ZXingObjC,peacemoon/ZXingObjC,Kevin775263419/ZXingObjC,Stocard/ZXingObjC,RockyAo/ZXingObjC,JeremyPacker/ZXingObjC,elegion/ios-pods-ZXingObjC,Kevin775263419/ZXingObjC,rowliny/ZXingObjC,cortices/ZXingObjC,TheLevelUp/ZXingObjC,zeffon/ZXingObjC,cortices/ZXingObjC,jebai0521/ZXingObjC,fuzhiqiang1989/ZXingObjC,RockyAo/ZXingObjC,TheLevelUp/ZXingObjC,fuzhiqiang1989/ZXingObjC,davidjackman/ZXingObjC,SinnerSchraderMobileMirrors/ZXingObjC,wuxsoft/ZXingObjC,xuxubin/ZXingObjC,davidjackman/ZXingObjC,fanwenkai/ZXingObjC,jianwoo/ZXingObjC,tejesh-alimilli/ZXingObjC,sdhzwm/ZXingObjC,zilaiyedaren/ZXingObjC,sdhzwm/ZXingObjC,ufs-slizhik/ZXingObjC,benjohnde/ZXingObjC,trsathya/ZXingObjC,jianwoo/ZXingObjC,rkpant/ZXingObjC,adan016/ZXingObjC,rowliny/ZXingObjC,peacemoon/ZXingObjC,adan016/ZXingObjC