Client name couldn't be resolved via rDNS if client has 2 names

[0xERR0R]

Issue Details

• Version of AdGuard Home server:
  • v0.99.3

Expected Behavior

If client has 2 names, one name (first or last) should be shown in Top Clients view

Actual Behavior

Only IP address will be shown

Details

I have FritzBox as router. I defined custom name for my laptop in Fritzbox UI. If i run reverse DNS against FritzBox, i get both names (manual defined and host name). AdGuard home retrieves both names als PTR record. In rdns.go there is a following check:

if len(resp.Answer) != 1 {
		log.Debug("No answer for rDNS lookup of %s", ip)
		return ""
	}

I think, this should be "==0".

Additional Information

Log file:

2019/12/04 21:21:55 1#65 [debug] github.com/AdguardTeam/dnsproxy/proxy.(*Proxy).logDNSMessage(): OUT: ;; opcode: QUERY, status: NOERROR, id: 33627                                                                              
adguard    | ;; flags: qr aa rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 1, ADDITIONAL: 3                                                                                                                                                         
adguard    |                                                                                                                                                                                                                                 
adguard    | ;; QUESTION SECTION:                                                                                                                                                                                                            
adguard    | ;29.178.168.192.in-addr.arpa.      IN       PTR                                                                                                                                                                                 
adguard    |                                                                                                                                                                                                                                 
adguard    | ;; ANSWER SECTION:                                                                                                                                                                                                              
adguard    | 29.178.168.192.in-addr.arpa.       9       IN      PTR     dell.fritz.box.                                                                                                                                                      
adguard    | 29.178.168.192.in-addr.arpa.       9       IN      PTR     Laptop-D.fritz.box.                                                                                                                                                  
adguard    |                                                                                                                                                                                                                                 
adguard    | ;; AUTHORITY SECTION:                                                                                                                                                                                                           
adguard    | 29.178.168.192.in-addr.arpa.       9       IN      NS      fritz.box.                                                                                                                                                           
adguard    |                                                                                                                                                                                                                                 
adguard    | ;; ADDITIONAL SECTION:                                                                                                                                                                                                          
adguard    | fritz.box. 9       IN      A       192.168.178.1                                                                                                                                                                                
adguard    | fritz.box. 9       IN      AAAA    fd00::ca0e:14ff:fe13:c3a6                                                                                                                                                                    
adguard    | fritz.box. 9       IN      AAAA    2a02:590:30a:4e00:ca0e:14ff:fe13:c3a6                                                                                                                                                        
adguard    |                                                                                                                                                                                                                                 
adguard    | 2019/12/04 21:21:55 1#11 [debug] No answer for rDNS lookup of 192.168.178.29