2008-02-06 Christian Franke <franke@computer.org>

2008-02-06  Christian Franke  <franke@computer.org>

	* fs/cpio.c (grub_cpio_find_file): Return GRUB_ERR_NONE
	(and set *ofs = 0) instead of GRUB_ERR_FILE_NOT_FOUND on
	last block of a cpio or tar stream.
	Check for "TRAILER!!!" instead of any empty data
	block to detect last block of a cpio stream.
	(grub_cpio_dir): Fix constness of variable np.
	(grub_cpio_open): Return GRUB_ERR_FILE_NOT_FOUND if
	cpio or tar trailer is detected.  This fixes a crash
	on open of a non existing file.