From 8e52acf70459020d7e9e9fda25066be4da520943 Mon Sep 17 00:00:00 2001
From: Li Zefan <lizf@cn.fujitsu.com>
Date: Mon, 12 Mar 2012 16:39:28 +0800
Subject: [PATCH] Btrfs: retrurn void from clear_state_bit

Currently it returns a set of bits that were cleared, but this return
value is not used at all.

Moreover it doesn't seem to be useful, because we may clear the bits
of a few extent_states, but only the cleared bits of last one is
returned.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
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