Fix leak in __btrfs_map_block error path

From: Dave Jones
Date: Tue Jul 30 2013 - 13:42:33 EST

If we bail out when the stripe alloc fails, we need to undo the
earlier allocation of raid_map.

Signed-off-by: Dave Jones <davej@xxxxxxxxxx>

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 78b8717..6a0f52f 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -4671,6 +4671,7 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
bbio = kzalloc(btrfs_bio_size(num_alloc_stripes), GFP_NOFS);
if (!bbio) {
+ kfree(raid_map);
ret = -ENOMEM;
goto out;
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