Fix the bench command
Fix the bench command

It would oops the kernel when trying to notify an event to user-space.

This bug has been here for more than 2 years...
Looks like we should run omx_cmd_bench a bit more often.

git-svn-id: 29c1264a5cf5e3532df57b06678e7347571c1a3c@2939 f1ba3bf5-cb5c-402b-92a9-7c6bdc83a356

ananos/xen2mx,ananos/xen2mx,ananos/open-mx,ananos/xen2mx,ananos/xen2mx,ananos/open-mx,ananos/open-mx