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b3e6aa9316
netlink offers the netlink.LinkNotFoundError type, which we can use with errors.As() to detect a unused link name. Additionally, early return if GenerateRandomName fails, as reading random bytes should be a highly reliable operation, and otherwise the error would be swallowed by the fall-through return. Signed-off-by: Bjorn Neergaard <bneergaard@mirantis.com>