* disk/i386/pc/biosdisk.c (grub_biosdisk_rw): Use ALIGN_UP macro
instead of manual alignment.
* kern/disk.c (grub_disk_read): Remove grub_dprintf call (excessively
verbose). Avoid attempts to read past end of the device
(grub_disk_adjust_range() guarantees that we can read `size' bytes,
but GRUB_DISK_CACHE_SIZE may exceed that).