NAS EPS: add a missing break

Change-Id: I71a32b831cdb8d7d07e48cabe2c6cd7204968c28
Reviewed-on: https://code.wireshark.org/review/14665
Reviewed-by: Pascal Quantin <pascal.quantin@gmail.com>

epan/dissectors/packet-nas_eps.c

@@ -3004,6 +3004,7 @@ de_esm_pkmf_address(tvbuff_t *tvb, proto_tree *tree, packet_info *pinfo _U_,
             break;
         case 2:
             proto_tree_add_item(tree, hf_nas_esm_pkmf_ipv6, tvb, curr_offset, 16, ENC_NA);
+            break;
         default:
             break;
     }