`ScanForWalletTransactions()` has the following comment about its return value:

```
 * Returns null if scan was successful. Otherwise, if a complete rescan was not
 * possible (due to pruning or corruption), returns pointer to the most recent
 * block that could not be scanned.
```

This is not strictly true. If `abortrescan` is called, then `ScanForWalletTransactions()` will return `nullptr`, even though the scan wasn't successful to the tip.

This in turn causes a minor bug in `importmulti`, where the call doesn't return the correct error and warning about potentially not finding transactions if `abortrescan` was called.

I think the correct fix is for `ScanForWalletTransactions()` to inform the caller that the rescan was aborted.
reservekey.KeepKey();
            
            
            AddToWallet(wtxNew);
            
            for (const CTxIn& txin : wtxNew.tx->vin)
            {
                CWalletTx &coin = mapWallet.at(txin.prevout.hash);
                coin.BindWallet(this);
                NotifyTransactionChanged(this, coin.GetHash(), CT_UPDATED);
            }
        }
        
        
        CWalletTx& wtx = mapWallet.at(wtxNew.GetHash());
        if (fBroadcastTransactions)
        {
            
            if (!wtx.AcceptToMemoryPool(*locked_chain, maxTxFee, state)) {
                WalletLogPrintf("CommitTransaction(): Transaction cannot be broadcast immediately, %s\n", FormatStateMessage(state));
                
            } else {
                wtx.RelayWalletTransaction(*locked_chain, connman);
            }
        }
    }
    return true;
}
DBErrors CWallet::LoadWallet(bool& fFirstRunRet)