* fs/ext2.c (pupa_ext2_read_file): Correct the value of BLOCKEND
when it is EXT2_BLOCK_SIZE (data). New argument READ_HOOK, all
callers changed. Set DATA->DISK->READ_HOOK to READ_HOOK before
reading and reset it after reading.
(pupa_ext2_close): Return PUPA_ERR_NONE.
* include/pupa/i386/pc/linux.h (PUPA_LINUX_INITRD_MAX_ADDRESS):
Correct value.
(struct linux_kernel_header): Add kernel_version and
initrd_addr_max.
* loader/i386/pc/linux.c (pupa_rescue_cmd_linux): Check whether
pupa_file_read succeeds.
(pupa_rescue_cmd_initrd): Implement.
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