### What it does
Checks for unnecessary double parentheses.

### Why is this bad?
This makes code harder to read and might indicate a
mistake.

### Example
```
fn simple_double_parens() -> i32 {
    ((0))
}

foo((0));
```

Use instead:
```
fn simple_no_parens() -> i32 {
    0
}

foo(0);
```