tty: Remove unused TTY_NUMBER() macro

TTY_NUMBER() has been unused since v2.5.71; removed by
"[PATCH] callout removal: callout is gone".

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index 320dc4d..3cdd63b 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -230,9 +230,6 @@
 	tty_free_file(file);
 }
 
-
-#define TTY_NUMBER(tty) ((tty)->index + (tty)->driver->name_base)
-
 /**
  *	tty_name	-	return tty naming
  *	@tty: tty structure