feat(contracts-eth): don't allow zero-address initialization in AdminControlled
#866
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Fix #844
Note: -
Instead of adding a new
require(_admin != address(0)(and copying the comment to describe why) I used existingverifyAdminAddress()to reduce redundancy but the existing method name and require error message might not be appropriate. Also, the fact thatnewAdmin != adminwill hit first rather than zero address check.