* boot/i386/pc/diskboot.S: Fix inaccurate comment.
* util/i386/pc/grub-setup.c: Include `<assert.h>'.
(struct boot_blocklist): Move from here ...
* include/grub/i386/pc/boot.h [ASM_FILE]
(struct grub_boot_blocklist): ... to here. Update all users.
(setup): Only initialize `start' member of `first_block'
structure. Add assert() calls to verify the other members.
* util/i386/pc/grub-mkimage.c: Include `<assert.h>'.
(generate_image): Fix broken blocklist length initialization.
Add assert() call to verify blocklist `segment' field.