tests: tail-2/append-only: don't discard stderr

* tests/tail-2/append-only: Don't discard a diagnostic that
may help explain why this test fails for some.  Details in
http://thread.gmane.org/gmane.comp.gnu.coreutils.bugs/17621/focus=17641

diff --git a/tests/tail-2/append-only b/tests/tail-2/append-only
index 0395271..0b4a959 100755 (executable)
--- a/tests/tail-2/append-only
+++ b/tests/tail-2/append-only
@@ -39,7 +39,7 @@ fail=0
 
 sleep 1 &
 pid=$!
-tail --pid=$pid -f f > /dev/null 2>&1 || fail=1
+tail --pid=$pid -f f || fail=1
 chattr -a f 2>/dev/null
 
 Exit $fail