[COMMITTED PATCH] fix _dl_close_worker warning

[Gary Benson]

Roland McGrath wrote:
> Gary, when we vet changes by eye we are assuming that the submitter
> has tested them and this includes verifying that they do not
> introduce new compiler warnings (except the occasional 'might be
> used uninitialized' when it's unavoidable without adding dead
> stores).  Please make sure you do not introduce any warnings in any
> future changes.

I apologise, I did not see the warning.

Thanks,
Gary

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