Fixed memory leak of syslog compression #557

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What changes were proposed in this pull request?

As deleted the fork by mistake,so I commit again. before pr

https://github.com/oceanbase/oceanbase/pull/597

Fixed Fixed memory leak of syslog compression #557 Fixed this file: /oceanbase/deps/oblib/src/lib/oblog/ob_log_compressor.cpp

Why are the changes needed?

Will break the compatibility? How if so?

Does this PR introduce any user-facing change?

How was this patch tested?

Checklist

NO ,

question https://open.oceanbase.com/answer/detail?id=13700737

• [ ] I've run the tests to see all new and existing tests pass.
• [ ] If this Pull Request resolves an issue, I linked to the issue in the text above.
• [ ] I've informed the technical writer about the documentation change if necessary.

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