Fix potential vulnerable cloned function #2321
                
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Hi Development Team,
I identified a potential vulnerability in a clone function in
extensions/curl/curl-src/src/writeout.csourced from curl/curl. This issue, originally reported in CVE-2017-7407, was resolved in the repository via this commit curl/curl@1890d59.This PR applies the corresponding patch to fix the vulnerability in this codebase.
Please review at your convenience. Thank you!