New issue by benalb on void-packages repository

https://github.com/void-linux/void-packages/issues/43024

Description:
### Is this a new report?

Yes

### System Info

Void 6.1.20_1 x86_64 GenuineIntel uptodate rFFFFFFF

### Package(s) Affected

dhcpcd-9.4.1_2

### Does a report exist for this bug with the project's home (upstream) and/or another distro?

A web search for "dhcpcd: ipv6nd_recvmsg" yields nothing. 

### Expected behaviour

dhcpcd should "just work".

### Actual behaviour

dhcpcd is spamming the logs:

`
2023-03-26T09:12:37.54829 daemon.err: Mar 26 11:12:37 dhcpcd[23095]: ipv6nd_recvmsg: No such process
2023-03-26T09:12:51.16793 daemon.err: Mar 26 11:12:51 dhcpcd[23095]: ipv6nd_recvmsg: No such process
`

[benalb@t470 ~]$    
grep -i ipv6nd /var/log/socklog/everything/current|wc -l
573

For now I was able to stop the errors adding 
`ipv4only`
to /etc/dhcpcd.conf

### Steps to reproduce

Just start dhcpcd.