[S390] tape: remove BKL from tape driver

Replace BLK with a per device mutex.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/drivers/s390/char/tape_block.c b/drivers/s390/char/tape_block.c
index c97c6aa..4799cc2 100644
--- a/drivers/s390/char/tape_block.c
+++ b/drivers/s390/char/tape_block.c
@@ -54,7 +54,7 @@
 	.owner		 = THIS_MODULE,
 	.open		 = tapeblock_open,
 	.release	 = tapeblock_release,
-	.locked_ioctl           = tapeblock_ioctl,
+	.ioctl		 = tapeblock_ioctl,
 	.media_changed   = tapeblock_medium_changed,
 	.revalidate_disk = tapeblock_revalidate_disk,
 };