**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
({f: () => { useState(); }});
        ({g() { useState(); }});
        const {j = () => { useState(); }} = {};
        ({k = () => { useState(); }} = {});
      `,
      errors: [
        functionError('useState', 'a'),
        functionError('useState', 'b'),
        functionError('useState', 'c'),
        functionError('useState', 'd'),
        functionError('useState', 'e'),
        functionError('useState', 'f'),
        functionError('useState', 'g'),
        functionError('useState', 'j'),
        functionError('useState', 'k'),
      ],
    },
    {
      code: `
        // Invalid because it's dangerous and might not warn otherwise.
        // This *must* be invalid.
        function useHook() {
          if (a) return;
          useState();
        }
      `,
      errors: [conditionalError('useState', true)],
    },
    {
      code: `