Buffett has said he'll never sell this stock.Warren Buffett was making headlines for some of his recent trades even before his 13F filing last week, which detailed all of Berkshire Hathaway's trades in the second quarter. But that latest Securities and Exchange Commission filing brought even more news, and not just about stocks he bought and sold. One of his best-loved stocks has climbed into the No. 2 spot in the Berkshire Hathaway portfolio, and it's a name Buffett-watchers know well.What happened in the ...