core: prevent integer underflow in ReadAllHashesInRange

[lucia-w]

• ReadAllHashesInRange pre-allocates the result slice with make([]*NumberHash, 0, 1+last-first) while first/last are uint64. If the caller passes an inverted range, it could cause the node to panic.

[gballet]

Hi, thanks a lot for your contribution! 🙏
At the moment, the go-ethereum team is overloaded with pull requests and in order to ensure we can give high quality review and attention to critical changes, we are not accepting refactoring-only PRs or minor upgrades.

We really appreciate the effort and encourage you to keep contributing, but for now we need to focus our limited review bandwidth on feature work, bug fixes, and protocol changes.

Thanks for understanding!