[PATCH] writeback: fix simple_return.cocci warnings

[kbuild test robot]

mm/backing-dev.c:513:1-4: WARNING: end returns can be simpified and declaration on line 502 can be dropped

 Simplify a trivial if-return sequence.  Possibly combine with a
 preceding function call.
Generated by: scripts/coccinelle/misc/simple_return.cocci

Signed-off-by: Fengguang Wu <fengguang.wu@xxxxxxxxx>
---

 backing-dev.c |    8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -499,8 +499,6 @@ static void bdi_wb_exit(struct bdi_write
 
 int bdi_init(struct backing_dev_info *bdi)
 {
-	int err;
-
 	bdi->dev = NULL;
 
 	bdi->min_ratio = 0;
@@ -510,11 +508,7 @@ int bdi_init(struct backing_dev_info *bd
 	INIT_LIST_HEAD(&bdi->bdi_list);
 	INIT_LIST_HEAD(&bdi->work_list);
 
-	err = bdi_wb_init(&bdi->wb, bdi);
-	if (err)
-		return err;
-
-	return 0;
+	return bdi_wb_init(&bdi->wb, bdi);
 }
 EXPORT_SYMBOL(bdi_init);
 
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