Same change as Revision r1395 for C++ port: Small speedup, per issue 422
Same change as Revision r1395 for C++ port: Small speedup, per issue 422

zilaiyedaren/zxing-iphone,zilaiyedaren/zxing-iphone,zilaiyedaren/zxing-iphone,joelind/zxing-iphone,joelind/zxing-iphone,joelind/zxing-iphone,zilaiyedaren/zxing-iphone,joelind/zxing-iphone,zilaiyedaren/zxing-iphone,zilaiyedaren/zxing-iphone,zilaiyedaren/zxing-iphone,joelind/zxing-iphone,joelind/zxing-iphone,joelind/zxing-iphone,zilaiyedaren/zxing-iphone,joelind/zxing-iphone