mm: use ERR_CAST

Author: Julia Lawall <julia@diku.dk>

Use ERR_CAST(x) rather than ERR_PTR(PTR_ERR(x)).  The former makes more
clear what is the purpose of the operation, which otherwise looks like a
no-op.

The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)

// 
@@
type T;
T x;
identifier f;
@@

T f (...) { <+...
- ERR_PTR(PTR_ERR(x))
+ x
 ...+> }

@@
expression x;
@@

- ERR_PTR(PTR_ERR(x))
+ ERR_CAST(x)
// 

Signed-off-by: Julia Lawall 
Cc: Nick Piggin 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds 

---
 mm/vmalloc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
 
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index b7e314b..8b5e437 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -732,7 +732,7 @@ static struct vmap_block *new_vmap_block(gfp_t gfp_mask)
 					node, gfp_mask);
 	if (unlikely(IS_ERR(va))) {
 		kfree(vb);
-		return ERR_PTR(PTR_ERR(va));
+		return ERR_CAST(va);
 	}
 
 	err = radix_tree_preload(gfp_mask);