Fix perl warning from commit 9b4eafcaf4

per gripe from Andres Freund and Tom Lane

Backpatch to all live branches.

diff --git a/src/test/perl/PostgresNode.pm b/src/test/perl/PostgresNode.pm
index d2f44c4ede07e38cc1041cb94f5e42dfe90dd8a3..cce3f621e713718100b39e3a977f1a3de71b78fe 100644 (file)
--- a/src/test/perl/PostgresNode.pm
+++ b/src/test/perl/PostgresNode.pm
@@ -1519,7 +1519,7 @@ sub _reserve_port
        # take an exclusive lock to avoid concurrent access
        flock($portfile, LOCK_EX) || die "locking port file $filename: $!";
        # see if someone else has or had a reservation of this port
-       my $pid = <$portfile>;
+       my $pid = <$portfile> || "0";
        chomp $pid;
        if ($pid +0 > 0)
        {