tool_operate: fix memory-leak on failed uploads

[bagder]

Add test case 1673 to do repeated upload failures and verify there is no leak.

Reported-by: James Fuller

[Copilot]

Pull request overview

This PR aims to fix a memory leak in the curl tool when uploads fail (especially under retry scenarios), and adds a regression test intended to catch the leak.

Changes:

• Centralize per_transfer resource cleanup in del_per_transfer() (including per->curl, per->url, per->outfile, per->uploadfile).
• Remove now-redundant per-transfer cleanup from post_per_transfer().
• Add test case 1673 and register it in the test data Makefile.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
src/tool_operate.c	Moves easy-handle and per-transfer string frees into del_per_transfer() to avoid leaks when transfers are deleted without full post-cleanup.
tests/data/test1673	Adds a new test intended to exercise repeated upload failures with --retry.
tests/data/Makefile.am	Registers test1673 in the testcases list.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.