Nov. 23 (Bloomberg) — Bloomberg’s Serena Saitto talks with Bloomberg’s Carol Massar and Matt Miller about the likelihood General Electric Co. will allow an initial public offering of Vivendi sa’s 20 percent holding in NBC Universal as talks to purchase the stake stall. An IPO would complicate plans to move forward with the creation of a joint venture combining NBC Universals film, cable-television and theme-park properties with networks owned by Comcast Corp., the largest US cable operator …