drivers/char/rocket.c: release_region or error path

There was a release_region() missing on the error path.
Signed-off-by: NDan Carpenter <error27@gmail.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

drivers/char/rocket.c

@@ -2345,7 +2345,7 @@ static int __init rp_init(void)
 	ret = tty_register_driver(rocket_driver);
 	if (ret < 0) {
 		printk(KERN_ERR "Couldn't install tty RocketPort driver\n");
-		goto err_tty;
+		goto err_controller;
 	}
 
 #ifdef ROCKET_DEBUG_OPEN
@@ -2380,6 +2380,9 @@ static int __init rp_init(void)
 	return 0;
 err_ttyu:
 	tty_unregister_driver(rocket_driver);
+err_controller:
+	if (controller)
+		release_region(controller, 4);
 err_tty:
 	put_tty_driver(rocket_driver);
 err: