test_common: avoid uninitialized warning on readlink

Of course, waiting for inotify to become active can't rely on
inotify, so we need to do a busy loop here, instead...

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/PublicInbox/TestCommon.pm b/lib/PublicInbox/TestCommon.pm
index 943dd2fa..ecf7a261 100644
--- a/lib/PublicInbox/TestCommon.pm
+++ b/lib/PublicInbox/TestCommon.pm
@@ -378,7 +378,7 @@ sub wait_for_tail {
                 my @ino;
                 do {
                         @ino = grep {
-                                readlink($_) =~ /\binotify\b/
+                                (readlink($_) // '') =~ /\binotify\b/
                         } glob("/proc/$tail_pid/fd/*");
                 } while (!@ino && time <= $end and tick);
                 return if !@ino;