Not needed zero address check

[code423n4]

Handle

0x0x0x

Vulnerability details

https://github.com/code-423n4/2021-12-sublime/blob/9df1b7c4247f8631647c7627a8da9bdc16db8b11/contracts/Verification/Verification.sol#L150

In Verfication.sol#unlinkAddress, there is a not needed zero address check.

require(_linkedTo != address(0), 'V:UA-Address not linked');
require(_linkedTo == msg.sender, 'V:UA-Not linked to sender');

Since, msg.sender != address(0), there is no need for a zero address check here.