t/op/fork.t: Don't output shell warning

If the shell doesn't support 'ulimit -u', it can cause unexpected
warnings that can cause the tests to fail.  This happens on s/390.

diff --git a/t/op/fork.t b/t/op/fork.t
index b69a929..be3125d 100644 (file)
--- a/t/op/fork.t
+++ b/t/op/fork.t
@@ -22,7 +22,7 @@ SKIP: {
     skip "This test can only be run under bash or zsh"
         unless $shell =~ m{/(?:ba|z)sh$};
     my $probe = qx{
-        $shell -c 'ulimit -u 1 2>&1 && echo good'
+        $shell -c 'ulimit -u 1 2>/dev/null && echo good'
     };
     chomp $probe;
     skip "Can't set ulimit -u on this system: $probe"