Fix leak in __btrfs_map_block error path

[Dave Jones]

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

Signed-off-by: Dave Jones <da...@redhat.com>

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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