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/libfs.c b/fs/libfs.c
index 5b2dbb3..7c895a7 100644
--- a/fs/libfs.c
+++ b/fs/libfs.c
@@ -491,11 +491,9 @@
 	inode->i_op = &simple_dir_inode_operations;
 	inode->i_fop = &simple_dir_operations;
 	set_nlink(inode, 2);
-	root = d_alloc_root(inode);
-	if (!root) {
-		iput(inode);
+	root = d_make_root(inode);
+	if (!root)
 		return -ENOMEM;
-	}
 	for (i = 0; !files->name || files->name[0]; i++, files++) {
 		if (!files->name)
 			continue;