Add check for \0 bytes in QNAME labels

distro/pkg/deb/libknot15.symbols

@@ -53,6 +53,7 @@ libknot.so.15 libknot15 #MINVER#
  knot_dname_to_wire@Base 3.4.0
  knot_dname_unpack@Base 3.4.0
  knot_dname_wire_check@Base 3.4.0
+ knot_dname_with_null@Base 3.4.3
  knot_dnssec_alg_names@Base 3.4.0
  knot_edns_add_option@Base 3.4.0
  knot_edns_alignment_size@Base 3.4.0