Fix one compil error and one potential bug

[raymondanadon]

• Fix compil error when option "WITH_CURL" is OFF
• Fix potential bug snprintf potential truncated str

[confluent-cla-assistant[bot]]

:tada: All Contributor License Agreements have been signed. Ready to merge.
:white_check_mark: raymondanadon
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[jerry-123123]

Can this be merged?

[tillrohrmann]

I would love to get this merged.