**Do you want to request a *feature* or report a *bug*?**
bug
**What is the current behavior?**
React hooks linter fails with this piece of code

```js
function useHook() {
  const ref = React.useRef([1, 2, 3]);
  const res = []
  // valid because there are not unexpected returns
  if (ref.current) {
    for (let i = 0; i !== ref.current.length && !ref.current[i]; ++i ) {
      res.push(ref.current[i]);
    }
  }
  React.useLayoutEffect(() => {});
}
```

however a bit more usual for loop is handled as expected
```js
function useHook() {
  const ref = React.useRef([1, 2, 3]);
  const res = []
  if (ref.current) {
    for (let i = 0; i !== ref.current.length; ++i ) {
      res.push(ref.current[i]);
    }
  }
  React.useLayoutEffect(() => {});
}
```

**What is the expected behavior?**

Skip for looks without returns

**Which versions of React, and which browser / OS are affected by this issue? Did this work in previous versions of React?**

eslint-plugin-react-hooks 0.0.0
}
    `,
    `
      // Valid although we *could* consider these invalid.
      // But it doesn't bring much benefit since it's an immediate runtime error anyway.
      // So might as well allow it.
      Hook.use();
      Hook._use();
      Hook.useState();
      Hook._useState();
      Hook.use42();
      Hook.useHook();
      Hook.use_hook();
    `,
    `
      // Valid -- this is a regression test.
      jest.useFakeTimers();
      beforeEach(() => {
        jest.useRealTimers();
      })
    `,
    `
      // Valid because that's a false positive we've seen quite a bit.
      // This is a regression test.
      class Foo extends Component {
        render() {
          if (cond) {
            FooStore.useFeatureFlag();
          }
        }