Using a temporary buffer pointer to avoid pointer corruption.

[Gautham-coder]

Proposed changes

The original pointer used for malloc() was getting corrupted while data write was happening, now we use a copy/temporary pointer. Thereby safeguarding the original pointer and avoiding the wrong free(), which was causing the abend.

This PR addresses Issue: https://github.com/zowe/zss/issues/693

Type of change

Please delete options that are not relevant.

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Change in a documentation
• [ ] Refactor the code
• [ ] Chore, repository cleanup, updates the dependencies.
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

PR Checklist

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• [x] If the changes in this PR are meant for the next release / mainline, this PR targets the "staging" branch.
• [x] My code follows the style guidelines of this project (see: Contributing guideline)
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [x] New and existing unit tests pass locally with my changes
• [ ] video or image is included if visual changes are made
• [x] Relevant update to CHANGELOG.md
• [x] My changes generate no new warnings
• [x] I have added tests that prove my fix is effective or that my feature works, or describe a test method below

Testing

You can create a script to upload chunks of data continuously using the PUT method.