Coverity static-analysis scan found unnecessary code in the DigestQuote.quoteNeeded() method on line 43 (currently).
One part of the condition is ch >= 0, which is always true, because the ch parameter has char type.

https://scan7.coverity.com/reports.htm#v16159/p11778/fileInstanceId=5760146&defectInstanceId=1541357&mergedDefectId=1375729

Suggested improvement
Remove the useless ch >= 0 from the expression.