Bluetooth: Remove __exit from rfcomm_cleanup_ttys()

rfcomm_cleanup_ttys() is also called from rfcomm_init(), so it can't
have __exit.

Reported-by: Mat Martineau <mathewm@codeaurora.org>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

net/bluetooth/rfcomm/tty.c

@@ -1183,7 +1183,7 @@ int __init rfcomm_init_ttys(void)
 	return 0;
 }
 
-void __exit rfcomm_cleanup_ttys(void)
+void rfcomm_cleanup_ttys(void)
 {
 	tty_unregister_driver(rfcomm_tty_driver);
 	put_tty_driver(rfcomm_tty_driver);