Built against `master` branch 801dd40666d1e6009920ad3ff755c7bb993b2a62:

If I have no wallet.dat file and run:

    bitcoind -usehd=0

A new wallet.dat file is created and an HD seed is assigned.

I see an error message in the source:

    "Error loading %s: You can't disable HD on an already existing HD wallet or create new non-HD wallets."

but that doesn't get shown because `fFirstRun` is true, and so the code which checks for `-usehd` values doesn't run.

If it's no longer possible to create non-HD wallets, specifying -usehd=0 when creating a wallet should be an error, and not get silently ignored.
}
        if (!walletInstance->IsHDEnabled() && useHD) {
            InitError(strprintf(_("Error loading %s: You can't enable HD on an already existing non-HD wallet"), walletFile));
            return nullptr;
        }
    }
    LogPrintf(" wallet      %15dms\n", GetTimeMillis() - nStart);
    RegisterValidationInterface(walletInstance);
    
    walletInstance->TopUpKeyPool();
    CBlockIndex *pindexRescan = chainActive.Genesis();
    if (!gArgs.GetBoolArg("-rescan", false))
    {
        CWalletDB walletdb(*walletInstance->dbw);
        CBlockLocator locator;
        if (walletdb.ReadBestBlock(locator))
            pindexRescan = FindForkInGlobalIndex(chainActive, locator);
    }
    if (chainActive.Tip() && chainActive.Tip() != pindexRescan)
    {
        
        
        
        if (fPruneMode)
        {
            CBlockIndex *block = chainActive.Tip();
            while (block && block->pprev && (block->pprev->nStatus & BLOCK_HAVE_DATA) && block->pprev->nTx > 0 && pindexRescan != block)
                block = block->pprev;
            if (pindexRescan != block) {
                InitError(_("Prune: last wallet synchronisation goes beyond pruned data. You need to -reindex (download the whole blockchain again in case of pruned node)"));