Make sure the new description isn't the same as the old description

Make sure the new description isn't the same as the old description

2001-10-17  Jeffrey Stedfast  <fejj@ximian.com>

	* camel-exception.c (camel_exception_set): Make sure the new
	description isn't the same as the old description pointer before
	freeing the old one.
	(camel_exception_setv): Don't free the old description until we
	set the new one this way we can reuse the old description in the
	new description.

	* providers/local/camel-mbox-folder.c (mbox_append_message): If
	errno == EINTR, then we got a user-cancel so set the exception
	appropriately so that we don't make the user shit his pants.