net/http: fix body close statement is missing

Call body close after ioutil.ReadAll is done

Change-Id: Ieceb1965a6a8f2dbc024e983acdfe22df17d07d1
Reviewed-on: https://go-review.googlesource.com/38059Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

src/net/http/filetransport_test.go

@@ -49,6 +49,7 @@ func TestFileTransport(t *testing.T) {
 			t.Fatalf("for %s, nil Body", urlstr)
 		}
 		slurp, err := ioutil.ReadAll(res.Body)
+		res.Body.Close()
 		check("ReadAll "+urlstr, err)
 		if string(slurp) != "Bar" {
 			t.Errorf("for %s, got content %q, want %q", urlstr, string(slurp), "Bar")