Heran Yang
9a4abe9909
When IPv4 ACD is enabled for a DHCPv4 address, the address remains in
the request queue until ACD succeeds. Hence, when ACD detects a
conflict, the address may not be present in link->addresses yet.
on_acd() currently looks up the address with address_get(), which only
searches link->addresses. This makes the callback return early and
prevents dhcp4_address_on_conflict() from sending DHCPDECLINE.
Use address_get_harder(), which also looks up pending address requests.
Fixes #39460
(cherry picked from commit 2aed6d9ad7)
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