Stocks Rebound, National Semi Stock Up  NEW YORK (Reuters) - U.S. stocks recovered from earlier  losses and rose early Thursday afternoon, with National  Semiconductor Corp. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=NSM.N target=/stocks/quickinfo/fullquote"&gt;NSM.N&lt;/A&gt; shares surging after the chip maker  said problems with excess inventory in the distribution channel  are behind it.