tty: Rename tty_type to tty_driver

There are too many "type" in code.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

include/tty.h

@@ -21,11 +21,11 @@ enum {
 
 extern const struct fdtype_ops tty_dump_ops;
 
-struct tty_type;
-struct tty_type *get_tty_type(int major, int minor);
+struct tty_driver;
+struct tty_driver *get_tty_driver(int major, int minor);
 static inline int is_tty(int major, int minor)
 {
-	return get_tty_type(major, minor) != NULL;
+	return get_tty_driver(major, minor) != NULL;
 }
 
 extern int dump_verify_tty_sids(void);