Detect uint64 overflow in config_parse_units()
The config_parse_units function uses 64-bit arithmetic, but does not detect 64-bit overflow. This means that values like "20000000 TB", which should be rejected, are instead mis-parsed.
Since this function is only used for configuration parsing, it's not a huge issue, but it should be simple enough to resolve this.
Found while working on 30893.
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