False positive when body is declared before if blocks

[mholt]

In this code, the body gets closed, but it is reported:

var resp *http.Response
if a {
	resp, err = httpClient.Do(req) // <-- false positive on this line
	if err != nil {
		return err
	}
} else {
	// resp = something else
}
defer resp.Body.Close()

The idea is that I can use just a single defer line to close the response body, no matter where it comes from.