ext4: don't open-code ERR_CAST

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 116ff68..c31717e 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -1556,7 +1556,7 @@ static struct dentry *ext4_lookup(struct inode *dir, struct dentry *dentry, unsi
 
 	bh = ext4_find_entry(dir, &dentry->d_name, &de, NULL);
 	if (IS_ERR(bh))
-		return (struct dentry *) bh;
+		return ERR_CAST(bh);
 	inode = NULL;
 	if (bh) {
 		__u32 ino = le32_to_cpu(de->inode);
@@ -1600,7 +1600,7 @@ struct dentry *ext4_get_parent(struct dentry *child)
 
 	bh = ext4_find_entry(d_inode(child), &dotdot, &de, NULL);
 	if (IS_ERR(bh))
-		return (struct dentry *) bh;
+		return ERR_CAST(bh);
 	if (!bh)
 		return ERR_PTR(-ENOENT);
 	ino = le32_to_cpu(de->inode);