riscom8: Fix hang on load

This has been around for a while but nobody reported it until recently.
Resubmitting the fix as it's appropriate for 2.6.25
Signed-off-by: NAlan Cox <alan@redhat.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

drivers/char/riscom8.c

@@ -1620,14 +1620,8 @@ static int __init rc_init_drivers(void)
 
 static void rc_release_drivers(void)
 {
-	unsigned long flags;
-
-	spin_lock_irqsave(&riscom_lock, flags);
-
 	tty_unregister_driver(riscom_driver);
 	put_tty_driver(riscom_driver);
-
-	spin_unlock_irqrestore(&riscom_lock, flags);
 }
 
 #ifndef MODULE