Eliminated up to 700 execeptions being thrown per image by changing one method to return -1 on failure.
Eliminated up to 700 execeptions being thrown per image by changing one method to return -1 on failure.

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