Avoid integer overflow in dhcp renewal #8154
Merged
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This ensures that we do not get an integer overflow after 64 contiguous
failures to renew a DHCP lease. That was resulting in a divide-by-zero
and, depending on how the runtime handling went, a silent exit or a panic.
It's unconfirmed whether it fixes #7680 but may well do so.
Related: #7680
Fixes: #8112