logic fix?

bin/sync-master-vhosts

@@ -20,7 +20,7 @@ my @vh = $ddns->get('_vhosts');
 my $changecount = 0;
 foreach my $i (@vh) {
     my $zf = "/var/lib/bind/vhost/db.$i->{zone}";
-    unless ( $force_replace || -f $zf ) {
+    if ( $force_replace || (! -f $zf) ) {
 	print "Generating new zone file for $i->{zone}\n";
 	open(my $fh, ">", $zf)
 	    || die "Can't create output file $zf: $!";