move ioutil.ReadAll() call into if stmt scope

internal/driver/fetch.go

 func statusCodeError(resp *http.Response) error {
 	if resp.Header.Get("X-Go-Pprof") != "" && strings.Contains(resp.Header.Get("Content-Type"), "text/plain") {
 		// error is from pprof endpoint
-		body, err := ioutil.ReadAll(resp.Body)
-		if err == nil {
+		if body, err := ioutil.ReadAll(resp.Body); err == nil {
 			return fmt.Errorf("server response: %s - %s", resp.Status, body)
 		}
 	}

internal/symbolizer/symbolizer.go

 func statusCodeError(resp *http.Response) error {
 	if resp.Header.Get("X-Go-Pprof") != "" && strings.Contains(resp.Header.Get("Content-Type"), "text/plain") {
 		// error is from pprof endpoint
-		body, err := ioutil.ReadAll(resp.Body)
-		if err == nil {
+		if body, err := ioutil.ReadAll(resp.Body); err == nil {
 			return fmt.Errorf("server response: %s - %s", resp.Status, body)
 		}
 	}