ryananicholson d20285b507 Correct DNS PTR record crash ...

When using `auxiliary/gather/enum_dns` and setting `NS` to an internal system, the following crash occurs (which is fixed with this PR):
```
[-] Auxiliary failed: NoMethodError undefined method `ptr' for #<Dnsruby::RR::IN::PTR:0x00007f8b9e9cb450>
```

2021-04-14 09:58:50 -04:00

..

client.rb

Zeitwerk rex folder

2021-02-08 12:24:12 +00:00

common.rb

Zeitwerk rex folder

2021-02-08 12:24:12 +00:00

enumeration.rb

Correct DNS PTR record crash

2021-04-14 09:58:50 -04:00

server.rb

Zeitwerk rex folder

2021-02-08 12:24:12 +00:00