Correct compilation errors reported by GCC 10/11

New `zfs_type_t` value `ZFS_TYPE_INVALID` is introduced.
Variable initialization is now possible to make GCC happy.

Reviewed by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: szubersk <szuberskidamian@gmail.com>
Closes #12167
Closes #13103

cmd/zpool_influxdb/zpool_influxdb.c

@@ -278,7 +278,7 @@ get_vdev_name(nvlist_t *nvroot, const char *parent_name)
 		    vdev_type);
 	} else {
 		(void) snprintf(vdev_name, sizeof (vdev_name),
-		    "%s/%s-%llu",
+		    "%.220s/%s-%llu",
 		    parent_name, vdev_type, (u_longlong_t)vdev_id);
 	}
 	return (vdev_name);