6in4: fix logic fail in previous commit

SVN-Revision: 22897

package/6in4/files/6in4.hotplug

@@ -32,7 +32,7 @@ if [ "$ACTION" = ifup ]; then
 			config_get password "$cfg" password
 
 			[ -n "$tunnelid" ] && [ -n "$username" ] && [ -n "$password" ] && {
-				[ "${#password}" == 32 -a -z "${password//[a-f0-9]/}" ] && {
+				[ "${#password}" == 32 -a -z "${password//[a-f0-9]/}" ] || {
 					password="$(echo -n "$password" | md5sum)"; password="${password%% *}"
 				}
 				uci_set_state network "$cfg" ipaddr "$wanip"