National Semi Quarterly Profit Rises  SAN FRANCISCO (Reuters) - 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;, a maker of chips used to manage power consumption in  electronics, on Thursday said quarterly profit rose, helped by  a one-time gain and a tax benefit, and it forecast a  smaller-than-usual sales decline in the current quarter.