dns.cgi: Fix check for undefined variable

This was positive when zero was returned.

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

diff --git a/html/cgi-bin/dns.cgi b/html/cgi-bin/dns.cgi
index a16d6971db9ac8d22b49960c67b53497b963d85a..ff228422bc3c00a42d41d78681591625673dc1f1 100755 (executable)
--- a/html/cgi-bin/dns.cgi
+++ b/html/cgi-bin/dns.cgi
@@ -553,7 +553,7 @@ END
                                        $status = &check_nameserver("$nameserver", "ping.ipfire.org", "$settings{'PROTO'}", "$tls_hostname");
                                }
 
-                               if (!$status) {
+                               if (!defined $status) {
                                        $status_short = "$Lang::tr{'disabled'}";
 
                                # DNSSEC Not supported