always return NULL in ata_probe function

[zja zja <zhangjianao@gmail.com>]

the ata_probe function is:
static struct kobject *ata_probe(dev_t dev, int *part, void *data)
{
        ide_hwif_t *hwif = data;
        int unit = *part >> PARTN_BITS;
        ide_drive_t *drive = &hwif->drives[unit];
        if (!drive->present)
                return NULL;

        if (drive->media == ide_disk)
                request_module("ide-disk");
        if (drive->scsi)
                request_module("ide-scsi");
        if (drive->media == ide_cdrom || drive->media == ide_optical)
                request_module("ide-cd");
        if (drive->media == ide_tape)
                request_module("ide-tape");
        if (drive->media == ide_floppy)
                request_module("ide-floppy");

        return NULL;
}

It will always return NULL, so it can't mount root device on boot time
in vmware, I don't know if it will work fine on other IDE disk. Is it
a problem?
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