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Clean memory on failure paths

Jakub Jelenrequested to merge
jjelen/libssh-mirror:fuzz into master

As reported by oss-fuzz, some memory was not correctly cleaned on exit paths. This should handle also couple of similar issues that I noticed around while investigating the issue.

So far private bug with more description: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=28490

Checklist

  • Commits have Signed-off-by: with name/author being identical to the commit author
  • Code modified for feature
  • [-] Test suite updated with functionality tests
  • [-] Test suite updated with negative tests
  • [-] Documentation updated

Reviewer's checklist:

  • Any issues marked for closing are addressed
  • There is a test suite reasonably covering new functionality or modifications
  • Function naming, parameters, return values, types, etc., are consistent and according to CONTRIBUTING.md
  • This feature/change has adequate documentation added
  • No obvious mistakes in the code

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