Fix codeql issue

Signed-off-by: Paul Dagnelie <[email protected]>

Author: Paul Dagnelie

module/zfs/vdev_anyraid.c

@@ -1358,8 +1358,8 @@ vdev_anyraid_write_map_sync(vdev_t *vd, zio_t *pio, uint64_t txg,
 	// Populate the header
 	uint16_t *sizes = kmem_zalloc(sizeof (*sizes) *
 	    anyraidvd->vdev_children, KM_SLEEP);
-	uint8_t disk_id = 0;
-	for (uint8_t i = 0; i < anyraidvd->vdev_children; i++) {
+	uint64_t disk_id = 0;
+	for (uint64_t i = 0; i < anyraidvd->vdev_children; i++) {
 		if (anyraidvd->vdev_child[i] == vd)
 			disk_id = i;
 		sizes[i] = var->vd_children[i]->van_capacity;