switch open-coded instances of d_make_root() to new helper

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/bfs/inode.c b/fs/bfs/inode.c
index b0391bc..e23dc7c 100644
--- a/fs/bfs/inode.c
+++ b/fs/bfs/inode.c
@@ -367,9 +367,8 @@
 		ret = PTR_ERR(inode);
 		goto out2;
 	}
-	s->s_root = d_alloc_root(inode);
+	s->s_root = d_make_root(inode);
 	if (!s->s_root) {
-		iput(inode);
 		ret = -ENOMEM;
 		goto out2;
 	}