thread: remove dead store from thread_cow_update
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@ -856,7 +856,6 @@ thread_cow_update(struct thread *td)
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struct plimit *oldlimit;
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p = td->td_proc;
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oldlimit = NULL;
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PROC_LOCK(p);
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oldcred = crcowsync();
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oldlimit = lim_cowsync();
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