Before the Bell: GE, Sirius Slip  NEW YORK (Reuters) - Shares of General Electric Co. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=GE.N target=/stocks/quickinfo/fullquote"&gt;GE.N&lt;/A&gt;  fell slightly before the bell on Friday after the industrial  conglomerate said quarterly earnings rose.