Cognitive complexity doesn't work for async functions

[JosuGZ]

Summary

I've been trying the cognitive complexity lint and I have found that on async functions it doesn't work. Here is an example, clippy will complain about complex, but not about complex_async:

#![allow(clippy::all)]
#![deny(clippy::cognitive_complexity)]

pub async fn complex_async() {
    let a = 0;
    if a == 0 {}
    if a == 0 {}
    if a == 0 {}
    if a == 0 {}
    if a == 0 {}
    if a == 0 {}
    if a == 0 {}
    if a == 0 {}
    if a == 0 {}
    if a == 0 {}
    if a == 0 {}
    if a == 0 {}
    if a == 0 {}
    if a == 0 {}
    if a == 0 {}
    if a == 0 {}
    if a == 0 {}
    if a == 0 {}
    if a == 0 {}
    if a == 0 {}
    if a == 0 {}
    if a == 0 {}
    if a == 0 {}
    if a == 0 {}
    if a == 0 {}
    if a == 0 {}
}

pub fn complex() {
    let a = 0;
    if a == 0 {}
    if a == 0 {}
    if a == 0 {}
    if a == 0 {}
    if a == 0 {}
    if a == 0 {}
    if a == 0 {}
    if a == 0 {}
    if a == 0 {}
    if a == 0 {}
    if a == 0 {}
    if a == 0 {}
    if a == 0 {}
    if a == 0 {}
    if a == 0 {}
    if a == 0 {}
    if a == 0 {}
    if a == 0 {}
    if a == 0 {}
    if a == 0 {}
    if a == 0 {}
    if a == 0 {}
    if a == 0 {}
    if a == 0 {}
    if a == 0 {}
    if a == 0 {}
}

[guerinoni]

If I look a good view of code the problem is in visit_expr, for some reasons it doesn't count the real complexity but return 1 as complexity for async version

[koka831]

@rustbot claim