the rest of drivers/*: annotate ->poll() instances

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/drivers/rpmsg/rpmsg_char.c b/drivers/rpmsg/rpmsg_char.c
index e0996fc..e622fcd 100644
--- a/drivers/rpmsg/rpmsg_char.c
+++ b/drivers/rpmsg/rpmsg_char.c
@@ -256,10 +256,10 @@ static ssize_t rpmsg_eptdev_write(struct file *filp, const char __user *buf,
 	return ret < 0 ? ret : len;
 }
 
-static unsigned int rpmsg_eptdev_poll(struct file *filp, poll_table *wait)
+static __poll_t rpmsg_eptdev_poll(struct file *filp, poll_table *wait)
 {
 	struct rpmsg_eptdev *eptdev = filp->private_data;
-	unsigned int mask = 0;
+	__poll_t mask = 0;
 
 	if (!eptdev->ept)
 		return POLLERR;