staging: ft1000-pcmcia: Fix ft1000_dnld() to work also on 64bit architectures.

Firmware file needs to be read by 4bytes also on 64 bit architectures.
Change long type to u32 and also extend checking. Tested on 32 and also
64 bit architectures.

Signed-off-by: Stano Lanci <chl.pixo@gmail.com>
Signed-off-by: Marek Belisko <marek.belisko@open-nandra.com>

Tested-by: Stano Lanci <chl.pixo@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>