From 4eb3991c5def39bcf553c14ebe2618fcb47b627f Mon Sep 17 00:00:00 2001
From: Dan Carpenter <error27@gmail.com>
Date: Tue, 10 Nov 2009 09:01:43 +0000
Subject: [PATCH] Btrfs: avoid null deref in unpin_extent_cache()

I re-orderred the checks to avoid dereferencing "em" if it was null.

Found by smatch static checker.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
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Reading git-format-patch failed