Rework /proc/locks via seq_files and seq_list helpers (v2)

index a1c1c01..d5b9653 100644
@@ -1354,6 +1354,7 @@ int fcntl_getlease(struct file *filp)
 int generic_setlease(struct file *filp, long arg, struct file_lock **flp)
 {
 	struct file_lock *fl, **before, **my_before = NULL, *lease;
+	struct file_lock *new_fl = NULL;
 	struct dentry *dentry = filp->f_path.dentry;
 	struct inode *inode = dentry->d_inode;
 	int error, rdlease_count = 0, wrlease_count = 0;

@@ -1380,6 +1381,11 @@ int generic_setlease(struct file *filp, 
 		|| (atomic_read(&inode->i_count) > 1)))
 		goto out;
 
+	error = -ENOMEM;
+	new_fl = locks_alloc_lock();
+	if (new_fl == NULL)
+		goto out;
+
 	/*
 	 * At this point, we know that if there is an exclusive
 	 * lease on this file, then we hold it on this filp

@@ -1422,18 +1428,15 @@ int generic_setlease(struct file *filp, 
 	if (!leases_enable)
 		goto out;
 
-	error = -ENOMEM;
-	fl = locks_alloc_lock();
-	if (fl == NULL)
-		goto out;
-
-	locks_copy_lock(fl, lease);
-
-	locks_insert_lock(before, fl);
+	locks_copy_lock(new_fl, lease);
+	locks_insert_lock(before, new_fl);
 
 	*flp = fl;
-	error = 0;
+	return 0;
+
 out:
+	if (new_fl != NULL)
+		locks_free_lock(new_fl);
 	return error;
 }
 EXPORT_SYMBOL(generic_setlease);