free the expires date, if set

free the expires date, if set

	* libsoup/soup-cookie.c (soup_cookie_free): free the expires date,
	if set

	* libsoup/soup-auth-domain-basic.h:
	* libsoup/soup-auth-domain-digest.h:
	* libsoup/soup-auth-domain.h:
	* libsoup/soup-cookie-jar.h:
	* libsoup/soup-logger.h:
	* libsoup/soup-multipart.h: add G_BEGIN/END_DECLS

	* libsoup/soup-date.c: add some g_return_if_fails

	Patches from and inspired by Xan Lopez, #522125

svn path=/trunk/; revision=1190