8654 unused local typedef in rpc code (fix lint)

8654 unused local typedef in rpc code
Reviewed by: Toomas Soome <tsoome@me.com>
Reviewed by: Yuri Pankov <yuripv@gmx.com>
Approved by: Dan McDonald <danmcd@joyent.com>

3106 rpc: xdr_sizeof can return wrong size
Reviewed by: Eric Schrock <eric.schrock@delphix.com>
Approved by: Richard Lowe <richlowe@richlowe.net>

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