Merge pull request #54756 from andrewrynhard/fix-bind-addr
Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.
kubeadm: fix the DNS addon bind address
**What this PR does / why we need it**:
Fixes a small bug introduced in #54437
The net package's definition of `To16` is as follows:
```
// To16 converts the IP address ip to a 16-byte representation.
// If ip is not an IP address (it is the wrong length), To16 returns nil.
func (ip IP) To16() IP {
if len(ip) == IPv4len {
return IPv4(ip[0], ip[1], ip[2], ip[3])
}
if len(ip) == IPv6len {
return ip
}
return nil
}
```
We can see that the `To16 ` function returns a non nil value when passed in an IPv4 address. This PR switches the check to use `To4()` instead, which will return `nil` when passed an IPv6 address.
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