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308dd2e93e92f4cac4e7d75478316af9bb2b77b8 Sanity assert GetAncestor() != nullptr where appropriate (Adam Jonas) Pull request description: Re-opening #17232. I have rebased the PR and addressed jonatack's nit suggestions. Add sanity asserts for return value of `CBlockIndex::GetAncestor()` where appropriate. In validation.cpp `CheckSequenceLocks`, check the return value of `tip->GetAncestor(maxInputHeight)` stored into `lp->maxInputBlock`. If it ever returns `nullptr` because the ancestor isn't found, it's going to be a bad bug to keep going, since a `LockPoints` object with the `maxInputBlock` member set to `nullptr` signifies no relative lock time. In the other places, the added asserts would prevent accidental dereferencing of a null pointer which is undefined behavior. Co-Authored-By: Adam Jonas <jonas@chaincode.com> Co-Authored-By: danra <danra@users.noreply.github.com> ACKs for top commit: jonatack: ACK 308dd2e93e92f4cac4e7d75478316af9bb2b77b8 Tree-SHA512: 5bfdaab1499607ae2c3cd3e2e9e8c37850bfd0e327e680f4e36c81f9c6d98a543af78ecfac1ab0e06325d264412615a04d52005875780c7db2a4d81bd2d2259a