This patch replaces an array size calculation in drivers/ide/legacy/hd.c
that was done using sizeof with the ARRAY_SIZE macro.

Tested by compilation on an i386 box using "allyesconfig".
Diffed against Linus' git-tree.
Signed-off-by: NAndi Drebes <lists-receive@programmierforen.de>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>