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>

6517377 path_get_descriptor_by_name() always returns NULL
6517388 rcm_daemon_call() may test uninitialized variable

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