vstor_gpx proper patch

// fixed storage params gen with exfat & small partitions support
int custom_vstor_gpx(void) {
    DBG("vstor_get_sparams\n");
    int ret = vstor_gpx();
    if (ret != 2)
        return ret;
    DBG("c_gpx open %s\n", mpath);
    int permz = ksceKernelSetPermission(0x40);
    int fd = ksceIoOpen(mpath, SCE_O_RDWR, 0777);
    if (fd < 0)
        goto ded;
    *(uint32_t *)(vstor_params_table + 0xc) = fd;
    DBG("c_gpx verify mbr\n");
    char mbr[0x200];
    memset(mbr, 0, 0x200);
    ksceIoRead(fd, mbr, 0x200);
    if (*(uint16_t *)(mbr + 0x1fe) != 0xaa55)
        goto ded;
    // set sector and device size
    *(uint32_t *)(vstor_params_table + 0x50) = (uint16_t)0x200;
    if (memcmp(mbr + 0x3, "EXFAT", 5) == 0) { // ExFAT device
        DBG("c_gpx set mode exfat\n");
        *(uint32_t *)(vstor_params_table + 0x10) = *(uint32_t *)(mbr + 0x48);
    } else {
        DBG("c_gpx set mode fat16\n");
        if (*(uint32_t *)(mbr + 0x20) > 0) // Use big sectors
            *(uint32_t *)(vstor_params_table + 0x10) = *(uint32_t *)(mbr + 0x20);
        else // Use small sectors
            *(uint32_t *)(vstor_params_table + 0x10) = (uint32_t)*(uint16_t *)(mbr + 0x13);
    }
    DBG("c_gpx done set evf\n");
    if (ksceIoLseek(fd, 0, SCE_SEEK_END) < 0)
        goto ded;
    ksceKernelSetPermission(permz);
    ksceKernelSetEventFlag(*(uint32_t *)(vstor_params_table + 0x38), 0x200);
    return 0;
ded:
    DBG("c_gpx died\n");
    if (fd > 0)
        ksceIoClose(fd);
    *(uint32_t *)(vstor_params_table + 0xc) = -1;
    ksceKernelSetPermission(permz);
    return -0x7fdbbeee;
}