worker memory is already freed on one fail path in btrfs_start_workers,
but is still dereferenced. Switch the dereference and kfree.

Signed-off-by: Jiri Slaby <jirisl...@gmail.com>
---
 fs/btrfs/async-thread.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/fs/btrfs/async-thread.c b/fs/btrfs/async-thread.c
index 7f88628..6e4f6c5 100644
--- a/fs/btrfs/async-thread.c
+++ b/fs/btrfs/async-thread.c
@@ -299,8 +299,8 @@ int btrfs_start_workers(struct btrfs_workers *workers, int 
num_workers)
                                           "btrfs-%s-%d", workers->name,
                                           workers->num_workers + i);
                if (IS_ERR(worker->task)) {
-                       kfree(worker);
                        ret = PTR_ERR(worker->task);
+                       kfree(worker);
                        goto fail;
                }
 
-- 
1.6.3.2

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