vtls: fix potential ssl_buffer stack overflow
In Curl_multissl_version() it was possible to overflow the passed in buffer if the generated version string exceeded the size of the buffer. Fix by inverting the logic, and also make sure to not exceed the local buffer during the string generation. Closes #3863 Reported-by: nevv on HackerOne/curl Reviewed-by: Jay Satiro Reviewed-by: Daniel Stenberg
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