setGuardian() Wrong implementation

[code423n4]

Handle

WatchPug

Vulnerability details

https://github.com/Badger-Finance/badger-ibbtc-utility-zaps/blob/6f700995129182fec81b772f97abab9977b46026/contracts/IbbtcVaultZap.sol#L116-L119

function setGuardian(address _guardian) external {
    _onlyGovernance();
    governance = _guardian;
}

https://github.com/Badger-Finance/badger-ibbtc-utility-zaps/blob/a5c71b72222d84b6414ca0339ed1761dc79fe56e/contracts/SettToRenIbbtcZap.sol#L130-L133

function setGuardian(address _guardian) external {
    _onlyGovernance();
    governance = _guardian;
}

governance = _guardian should be guardian = _guardian.