Before the Bell: CMS, Krispy Kreme Fall  NEW YORK (Reuters) - Shares of CMS Energy Corp. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=CMS.N target=/stocks/quickinfo/fullquote"&gt;CMS.N&lt;/A&gt;  fell before the bell on Friday after it priced a public  offering of 28.5 million shares at \$9.10 per share.