xen/fb: fix potential memory leak

xen/fb: fix potential memory leak

From: Joe Jin <joe.jin@oracle.com>

This patch fixes a potential memory leak when xenfb connect to
the backend fails.

Thanks for Ian's review and comments.

[v2: reworded the commit message a bit]

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Joe Jin <joe.jin@oracle.com>
Tested-by: Gurudas Pai <gurudas.pai@oracle.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Made apply to linux-2.6.18-xen.hg.

Signed-off-by: Jan Beulich <jbeulich@novell.com>