Fix DHCP ACK parsing

[danielinux]

• fenrir / C-2

• fernir security / C-1

[Copilot]

Pull request overview

This PR fixes a critical bug in DHCP ACK message parsing where a reused variable caused all DHCP options to use the value from the first option, resulting in incorrect network configuration. The fix moves the variable declaration inside the parsing loop, and the test is enhanced to verify all DHCP options are parsed correctly with distinct values.

Changes:

• Fixed variable scoping bug in dhcp_parse_ack that caused all DHCP options to reuse the first option's value
• Enhanced test coverage to verify IP address, netmask, gateway, and DNS are all parsed correctly with distinct values

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/wolfip.c	Moved data variable declaration inside the option parsing loop to ensure each DHCP option is parsed with its own value instead of reusing the first option's value
src/test/unit/unit.c	Added separate test variables for router and DNS IPs, added DHCP_OPTION_ROUTER and DHCP_OPTION_OFFER_IP to test message, and added assertions to verify all configuration fields are set correctly

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