orangefs: ->poll() doesn't need spinlock

not just for list_empty()...
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Mike Marshall <hubcap@omnibond.com>

fs/orangefs/devorangefs-req.c

@@ -941,10 +941,8 @@ static unsigned int orangefs_devreq_poll(struct file *file,
 
 	poll_wait(file, &orangefs_request_list_waitq, poll_table);
 
-	spin_lock(&orangefs_request_list_lock);
 	if (!list_empty(&orangefs_request_list))
 		poll_revent_mask |= POLL_IN;
-	spin_unlock(&orangefs_request_list_lock);
 	return poll_revent_mask;
 }