Don't promise a non-zero return size in error cases.

Don't promise a non-zero return size in error cases.

When a requested parameter has a non-NULL result pointer,
and the error isn't simply that the result buffer is too
small, don't return a non-zero result size.

Returning a non-zero result size that isn't larger than the
user's provided space is an indication that a result of
that size was actually written, inviting trouble if the
error indication was inadvertenly lost.

Also, in such cases (wrong type, data can't be converted to the
requested type when otherwise supported, ...) there is nothing useful to
be done with the return size value, it can't help to address the
problem.

Reviewed-by: Tim Hudson <tjh@openssl.org>
Reviewed-by: Paul Dale <ppzgs1@gmail.com>
(Merged from https://github.com/openssl/openssl/pull/26436)