From 39bab87ba6f4d8cce2b70c19e60233ad8030d7b4 Mon Sep 17 00:00:00 2001
From: Wang Sheng-Hui <shhuiw@gmail.com>
Date: Fri, 6 Apr 2012 14:35:31 +0800
Subject: [PATCH] Btrfs: fix btrfs_release_extent_buffer_page with the right
 usage of num_extent_pages

num_extent_pages returns the number of pages in the specific range, not
the index of the last page in the eb range.

btrfs_release_extent_buffer_page is called with start_idx set 0 in current
codes, so it's not a problem yet. But the logic is indeed wrong.

Fix it here.

Signed-off-by: Wang Sheng-Hui <shhuiw@gmail.com>
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