### What it does
Checks for unnecessary `ok()` in `while let`.

### Why is this bad?
Calling `ok()` in `while let` is unnecessary, instead match
on `Ok(pat)`

### Example
```
while let Some(value) = iter.next().ok() {
    vec.push(value)
}

if let Some(value) = iter.next().ok() {
    vec.push(value)
}
```
Use instead:
```
while let Ok(value) = iter.next() {
    vec.push(value)
}

if let Ok(value) = iter.next() {
       vec.push(value)
}
```