False positive with closure outside of `if` body

```go
var rc io.ReadCloser
if true {
  resp, err := http.Get("http://foo")
	rc = resp.Body
  if err != nil {
  	print(err)
  }
}
defer rc.Close()
```

This highlights a false-positive when `resp.Body` is closed outsite the `if` body. Removing the `if` wrapping makes it correctly detect it.