Atari Falcon IDE: Add missing hwif variable

Commit cbb010c1

    ide: drop 'initializing' argument from ide_register_hw()

    * Rename init_hwif_data() to ide_init_port_data() and export it.

    * For all users of ide_register_hw() with 'initializing' argument set
      hwif->present and hwif->hold are always zero so convert these host
      drivers to use ide_find_port()+ide_init_port_data()+ide_init_port_hw()
      instead (also no need for init_hwif_default() call since the setup
      done by it gets over-ridden by ide_init_port_hw() call).

    * Drop 'initializing' argument from ide_register_hw().

introduced the usage of a hwif variable, but forgot to declare the actual
variable.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>