legacy_tracing.c: Unchecked PyLong_AsInt in tracing callbacks

[aisk]

Bug report

Bug description:

Original gist: https://gist.github.com/devdanzin/d1a6ab9f62970be0cae139366ce3c482

Summary

sys_trace_jump_func (line 382-384) and sys_trace_line_func (line 355): PyLong_AsInt error return -1 not checked. Proceeds with wrong values and pending exception.

Fix

Add if (result == -1 && PyErr_Occurred()) return NULL; checks.

CPython versions tested on:

CPython main branch

Operating systems tested on:

No response

Linked PRs

• gh-153622: Check PyLong_AsInt errors in legacy tracing #153623