gpg: Use usual free semantics for packet structure free functions.
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gpg: Use usual free semantics for packet structure free functions.

* g10/free-packet.c (free_attributes): Turn function into a nop for a
NULL arg.
(free_user_id): Ditto.
(free_compressed): Ditto.
(free_encrypted): Ditto.
(free_plaintext): Ditto.
(release_public_key_parts): Avoid extra check for NULL.
* g10/getkey.c (get_best_pubkey_byname): Ditto.

This change avoid surprises because it is common that function named
like free and taking a pointer also have similar semantics.