tty: Flags should be accessed via the foo_bit interfaces

We have various drivers that poke around directly and we need to clean this
up before it causes problems.

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/wireless/strip.c b/drivers/net/wireless/strip.c
index cf0d070..f93caf4 100644
--- a/drivers/net/wireless/strip.c
+++ b/drivers/net/wireless/strip.c
@@ -1252,7 +1252,7 @@
 #endif
 	} else {		/* Else start transmission of another packet */
 
-		tty->flags &= ~(1 << TTY_DO_WRITE_WAKEUP);
+		clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
 		strip_unlock(strip_info);
 	}
 }
@@ -1455,8 +1455,7 @@
 	 */
 	strip_info->tx_head = strip_info->tx_buff;
 	strip_info->tx_left = ptr - strip_info->tx_buff;
-	strip_info->tty->flags |= (1 << TTY_DO_WRITE_WAKEUP);
-
+	set_bit(TTY_DO_WRITE_WAKEUP, &strip_info->tty->flags);
 	/*
 	 * 4. Debugging check to make sure we're not overflowing the buffer.
 	 */
@@ -2454,8 +2453,7 @@
 
 	if (strip_info->tty == NULL)
 		return -EBUSY;
-	strip_info->tty->flags &= ~(1 << TTY_DO_WRITE_WAKEUP);
-
+	clear_bit(TTY_DO_WRITE_WAKEUP, &strip_info->tty->flags);
 	netif_stop_queue(dev);
 
 	/*