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

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/drivers/bluetooth/hci_ldisc.c b/drivers/bluetooth/hci_ldisc.c
index c823914..b6a7170 100644
--- a/drivers/bluetooth/hci_ldisc.c
+++ b/drivers/bluetooth/hci_ldisc.c
@@ -794,7 +794,7 @@ static ssize_t hci_uart_tty_write(struct tty_struct *tty, struct file *file,
 	return 0;
 }
 
-static unsigned int hci_uart_tty_poll(struct tty_struct *tty,
+static __poll_t hci_uart_tty_poll(struct tty_struct *tty,
 				      struct file *filp, poll_table *wait)
 {
 	return 0;