[LTP] Rewrite ftrace_regression tests with new C API

[linuxtestproject.agent@gmail.com]

Hi lufei,

On Fri, 24 Apr 2026, lufei wrote:
> [PATCH] Rewrite ftrace_regression tests with new C API

> +++ b/testcases/kernel/tracing/ftrace_test/ftrace_regression.h
> +/* SPDX-License-Identifier: GPL-2.0-or-later

SPDX must use the single-line style: // SPDX-License-Identifier: GPL-2.0-or-later

> + create mode 100644 testcases/kernel/tracing/ftrace_test/ftrace_regression01.c
> + create mode 100644 testcases/kernel/tracing/ftrace_test/ftrace_regression02.c

This adds two new test cases in a single commit. Please split into one
commit per test; ftrace_regression.h can go with the first.

[...]

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