btrfs: dereferencing freed memory

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This was found by smatch (http://repo.or.cz/w/smatch.git/)

regards,
dan carpenter

Signed-off-by: Dan Carpenter <error27@xxxxxxxxx>
--- orig/fs/btrfs/async-thread.c	2009-03-26 16:36:46.000000000 +0300
+++ devel/fs/btrfs/async-thread.c	2009-03-26 16:39:08.000000000 +0300
@@ -278,8 +278,8 @@
 					   workers->num_workers + i);
 		worker->workers = workers;
 		if (IS_ERR(worker->task)) {
-			kfree(worker);
 			ret = PTR_ERR(worker->task);
+			kfree(worker);
 			goto fail;
 		}
 
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