nfs: plug memory leak when ->prepare_layoutcommit fails
"data" is currently leaked when the prepare_layoutcommit operation returns an error. Put the cred before taking the spinlock in that case, take the lock and then goto out_unlock which will drop the lock and then free "data". Signed-off-by: NJeff Layton <jeff.layton@primarydata.com> Signed-off-by: NTrond Myklebust <trond.myklebust@primarydata.com>
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