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6659 nvlist_free(NULL) is a no-op Reviewed by: Toomas Soome <tsoome@me.com> Reviewed by: Marcel Telka <marcel@telka.sk> Approved by: Robert Mustacchi <rm@joyent.com> References: https://www.illumos.org/issues/6659 https://github.com/illumos/illumos-gate/commit/aab83bb Ported-by: David Quigley <dpquigl@davequigley.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #4566