test_common: fix excessive wait for GNU tail inotify

We want to use the filenames tail will watch, not the number of
args passed to the `tail_f' subroutine.

Fixes: 9231d2e7b93f (tests: map CLOFORK->FD_CLOEXEC temporarily for `tail -f')

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/PublicInbox/TestCommon.pm b/lib/PublicInbox/TestCommon.pm
index 8bfa30f2..0d17e6e7 100644
--- a/lib/PublicInbox/TestCommon.pm
+++ b/lib/PublicInbox/TestCommon.pm
@@ -512,7 +512,7 @@ sub tail_f (@) {
         while (my ($io, $fl) = splice(@cfmap, 0, 2)) {
                 fcntl($io, F_SETFD, $fl);
         }
-        wait_for_tail($pid, scalar @_);
+        wait_for_tail($pid, scalar @f);
         require PublicInbox::AutoReap;
         PublicInbox::AutoReap->new($pid, \&wait_for_tail);
 }