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

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/ocfs2/super.c

@@ -1166,9 +1166,8 @@ static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
 		goto read_super_error;
 	}
 
-	root = d_alloc_root(inode);
+	root = d_make_root(inode);
 	if (!root) {
-		iput(inode);
 		status = -ENOMEM;
 		mlog_errno(status);
 		goto read_super_error;