Warren Buffett says bitcoin 'definitely will come to a bad ending'   Berkshire Hathaway CEO Warren Buffett said Wednesday that the firm had no interest in jumping on the cryptocurrency bandwagon.  We don't own any; we're not short any Buffett said in an interview on CNBC. We'll never have a position in them.  Of options trades that would profit from price declines he added: If I could buy a five-year put on every one of the cryptocurrencies I'd be glad to do it but I would never short a…