output number of exts from tls_collect_extensions()
Modify the API of tls_collect_extensions() to be able to output the number of extensions that are known (i.e., the length of its 'res' output). This number can never be zero on a successful return due to the builtin extensions list, but use a separate output variable so as to not overload the return value semantics. Having this value easily available will give consumers a way to avoid repeating the calculation. Reviewed-by:Matt Caswell <matt@openssl.org> Reviewed-by:
Richard Levitte <levitte@openssl.org> (Merged from https://github.com/openssl/openssl/pull/2279)
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