json_lexer_init() takes the function to process a token as an
argument. It's always json_message_process_token(). Makes the code
harder to understand for no actual gain. Drop the indirection.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <20180823164025.12553-34-armbru@redhat.com>