tty: Remove some pointless casts

disc_data and driver_data are void *

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/char/generic_serial.c b/drivers/char/generic_serial.c
index 2f040d1..9e4e569 100644
--- a/drivers/char/generic_serial.c
+++ b/drivers/char/generic_serial.c
@@ -511,7 +511,7 @@
 	
 	func_enter ();
 
-	port = (struct gs_port *) tty->driver_data;
+	port = tty->driver_data;
 
 	if (!port) return;