--- dnswalk.orig	2017-05-12 19:34:32 UTC
+++ dnswalk
@@ -56,9 +56,9 @@ sub dowalk {
     return unless $domain;
     print "Checking $domain\n";
     @subdoms=&doaxfr($domain);
-    &check_zone($domain) if (defined(@zone) && @zone);
+    &check_zone($domain) if (@zone);
     undef @zone;
-    return if (!(defined(@subdoms) && @subdoms));
+    return if (! @subdoms);
     @sortdoms = sort byhostname @subdoms;
     local ($subdom);
     if ($opt_r) {
@@ -84,7 +84,7 @@ sub doaxfr {
 	my $res = new Net::DNS::Resolver;
 	$res->nameservers($server);
 	@zone=$res->axfr($domain);
-	unless (defined(@zone) && @zone) {
+	unless (@zone) {
 	    print STDERR "failed\n";
 		&printerr("FAIL",
 			"Zone transfer of $domain from $server failed: ".
@@ -104,7 +104,7 @@ sub doaxfr {
         print STDERR "done.\n";
         last SERVER;
     } # foreach #
-    unless (defined(@zone) && @zone) {
+    unless (@zone) {
 	    &printerr("BAD","All zone transfer attempts of $domain failed!\n");
 	    return undef;
     }