tool: return code variable consistency

[bagder]

• ParameterError variables are named 'err'
• CURLcode variables are named 'result'

For naming consistency across functions

[bagder]

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[augmentcode]

🤖 Augment PR Summary

Summary: Normalizes local error/return-code variable naming in curl’s tool sources for consistency.

Changes:

• Renamed local CURLcode variables from ret/res/r to result across several helper functions.
• Renamed local ParameterError variables from result/res to err (e.g., argument parsing and numeric parsing helpers).
• Adjusted related control-flow checks and logging statements to use the new identifiers.

Technical Notes: This is a naming-only refactor intended to preserve behavior while making it clearer which values are libcurl CURLcode results vs. tool parameter parsing errors.

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[augmentcode]

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