Fun with purify.

	Fun with purify.

	* providers/pop3/camel-pop3-store.c (pop3_connect): free msg on
	success as well as failure.
	(camel_pop3_command_get_additional_data): free buf after reading
	the last line (".").

	* providers/pop3/camel-pop3-folder.c (get_message_by_uid): free
	body data after creating the memstream from it (which will copy
	the data).

	* providers/mbox/camel-mbox-folder.c (mbox_finalize): free summary
	and index paths.

	* camel-data-wrapper.c (finalize): unref the stream, if it exists.