[clang-tidy] False positive cert-flp30-c for additional floating-point increment in loop

~~~c++
void f(int N, double delta) {
    double d = 0.0;
    for (int i = 0; i < N; ++i, d += delta) {}
}
~~~
~~~
<source>:3:31: warning: loop induction expression should not have floating-point type [cert-flp30-c]
    3 |     for (int i = 0; i < N; ++i, d += delta) {}
      |
~~~
The loop variable is `i`, which is an integer.
https://godbolt.org/z/8WjhrerdK