asn1parse: avoid double free
|str| was used for multiple conflicting purposes. When using '-strictpem', it's used to uniquely hold a reference to the loaded payload. However, when using '-strparse', |str| was re-used to hold the position from where to start parsing. So when '-strparse' and '-strictpem' are were together, |str| ended up pointing into data pointed at by |at|, and was yet being freed, with the result that the payload it held a reference to became a memory leak, and there was a double free conflict when both |str| and |at| were being freed. The situation is resolved by always having |buf| hold the pointer to the file data, and always and only use |str| to hold the position to start parsing from. Now, we only need to free |buf| properly and not |str|. Fixes #8752 Reviewed-by: Matthias St. Pierre <Matthias.St.Pierre@ncp-e.com> (Merged from https://github.com/openssl/openssl/pull/8753)
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