Nit: fix use of bufio.Scanner.Err

The Err() method should be called after the Scan() loop, not inside it.

Found by: git grep -A3 -F '.Scan()'

Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>

runtime/v2/README.md

@@ -227,9 +227,6 @@ func copy(wg *sync.WaitGroup, r io.Reader, pri journal.Priority, vars map[string
 	defer wg.Done()
 	s := bufio.NewScanner(r)
 	for s.Scan() {
-		if s.Err() != nil {
-			return
-		}
 		journal.Send(s.Text(), pri, vars)
 	}
 }