net/http: remove unnecessary return

Change-Id: I93bc5de6bcb23c2639d7c2f3f5252fb6f09ca6e4
Reviewed-on: https://go-review.googlesource.com/126797Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

src/net/http/server.go

@@ -3176,7 +3176,6 @@ func (h *timeoutHandler) ServeHTTP(w ResponseWriter, r *Request) {
 		w.WriteHeader(StatusServiceUnavailable)
 		io.WriteString(w, h.errorBody())
 		tw.timedOut = true
-		return
 	}
 }