tty: fix chars_in_buffers

This function does not have an error return and returning an error is
instead interpreted as having a lot of pending bytes.

Reported by Jeff Harris who provided a list of some of the remaining
offenders.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/char/hvc_console.c b/drivers/char/hvc_console.c
index 94e7e3c..d97779e 100644
--- a/drivers/char/hvc_console.c
+++ b/drivers/char/hvc_console.c
@@ -552,7 +552,7 @@
 	struct hvc_struct *hp = tty->driver_data;
 
 	if (!hp)
-		return -1;
+		return 0;
 	return hp->n_outbuf;
 }
 
diff --git a/drivers/char/nozomi.c b/drivers/char/nozomi.c
index 280b41c..ec58d8c 100644
--- a/drivers/char/nozomi.c
+++ b/drivers/char/nozomi.c
@@ -1866,16 +1866,14 @@
 {
 	struct port *port = tty->driver_data;
 	struct nozomi *dc = get_dc_by_tty(tty);
-	s32 rval;
+	s32 rval = 0;
 
 	if (unlikely(!dc || !port)) {
-		rval = -ENODEV;
 		goto exit_in_buffer;
 	}
 
 	if (unlikely(!port->port.count)) {
 		dev_err(&dc->pdev->dev, "No tty open?\n");
-		rval = -ENODEV;
 		goto exit_in_buffer;
 	}
 
diff --git a/drivers/char/pcmcia/ipwireless/tty.c b/drivers/char/pcmcia/ipwireless/tty.c
index 569f2f7..674b3ab 100644
--- a/drivers/char/pcmcia/ipwireless/tty.c
+++ b/drivers/char/pcmcia/ipwireless/tty.c
@@ -320,10 +320,10 @@
 	struct ipw_tty *tty = linux_tty->driver_data;
 
 	if (!tty)
-		return -ENODEV;
+		return 0;
 
 	if (!tty->open_count)
-		return -EINVAL;
+		return 0;
 
 	return tty->tx_bytes_queued;
 }