Remove redundant defer close in untarAll

[tedyu]

What type of PR is this?
/kind cleanup

What this PR does / why we need it:
The defer close is redundant - the file is closed on line 487.

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

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[APPROVALNOTIFIER] This PR is NOT APPROVED

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[tedyu]

cc @tallclair @soltysh

[tedyu]

The io.Copy() call may return early.
So the defer is needed.