usbms_get_coordinate
static int usbms_get_coordinate(uint_t, uint_t, mblk_t *);
mi->mi_x += usbms_get_coordinate((usbmsp->usbms_idf).xpos,
mi->mi_y += usbms_get_coordinate((usbmsp->usbms_idf).ypos,
mi->mi_z += usbms_get_coordinate((usbmsp->usbms_idf).zpos,