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/coda/inode.c b/fs/coda/inode.c
index 32dafc8..05156c1 100644
--- a/fs/coda/inode.c
+++ b/fs/coda/inode.c
@@ -213,9 +213,8 @@
 
 	printk("coda_read_super: rootinode is %ld dev %s\n", 
 	       root->i_ino, root->i_sb->s_id);
-	sb->s_root = d_alloc_root(root);
+	sb->s_root = d_make_root(root);
 	if (!sb->s_root) {
-		iput(root);
 		error = -EINVAL;
 		goto error;
 	}