unregister_blkdev() delete redundant messages in callers

No need to warn unregister_blkdev() failure by the callers.  (The previous
patch makes unregister_blkdev() print error message in error case)

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 06eaa11..e425daa 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -1568,8 +1568,7 @@
 		loop_del_one(lo);
 
 	blk_unregister_region(MKDEV(LOOP_MAJOR, 0), range);
-	if (unregister_blkdev(LOOP_MAJOR, "loop"))
-		printk(KERN_WARNING "loop: cannot unregister blkdev\n");
+	unregister_blkdev(LOOP_MAJOR, "loop");
 }
 
 module_init(loop_init);
diff --git a/drivers/block/z2ram.c b/drivers/block/z2ram.c
index 2abf94c..e40fa98 100644
--- a/drivers/block/z2ram.c
+++ b/drivers/block/z2ram.c
@@ -371,9 +371,7 @@
 {
     int i, j;
     blk_unregister_region(MKDEV(Z2RAM_MAJOR, 0), 256);
-    if ( unregister_blkdev( Z2RAM_MAJOR, DEVICE_NAME ) != 0 )
-	printk( KERN_ERR DEVICE_NAME ": unregister of device failed\n");
-
+    unregister_blkdev(Z2RAM_MAJOR, DEVICE_NAME);
     del_gendisk(z2ram_gendisk);
     put_disk(z2ram_gendisk);
     blk_cleanup_queue(z2_queue);
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index f4f7d35..846614e 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -161,9 +161,7 @@
 {
 	kmem_cache_destroy(_tio_cache);
 	kmem_cache_destroy(_io_cache);
-
-	if (unregister_blkdev(_major, _name) < 0)
-		DMERR("unregister_blkdev failed");
+	unregister_blkdev(_major, _name);
 
 	_major = 0;
 
diff --git a/drivers/s390/block/dcssblk.c b/drivers/s390/block/dcssblk.c
index 1340451..35765f6 100644
--- a/drivers/s390/block/dcssblk.c
+++ b/drivers/s390/block/dcssblk.c
@@ -747,14 +747,9 @@
 static void __exit
 dcssblk_exit(void)
 {
-	int rc;
-
 	PRINT_DEBUG("DCSSBLOCK EXIT...\n");
 	s390_root_dev_unregister(dcssblk_root_dev);
-	rc = unregister_blkdev(dcssblk_major, DCSSBLK_NAME);
-	if (rc) {
-		PRINT_ERR("unregister_blkdev() failed!\n");
-	}
+	unregister_blkdev(dcssblk_major, DCSSBLK_NAME);
 	PRINT_DEBUG("...finished!\n");
 }
 
diff --git a/drivers/sbus/char/jsflash.c b/drivers/sbus/char/jsflash.c
index 512857a..5157a2a 100644
--- a/drivers/sbus/char/jsflash.c
+++ b/drivers/sbus/char/jsflash.c
@@ -619,8 +619,7 @@
 	jsf0.busy = 0;
 
 	misc_deregister(&jsf_dev);
-	if (unregister_blkdev(JSFD_MAJOR, "jsfd") != 0)
-		printk("jsfd: cleanup_module failed\n");
+	unregister_blkdev(JSFD_MAJOR, "jsfd");
 	blk_cleanup_queue(jsf_queue);
 }