import: ignore return on hostid lookups

Just silencing a warning. Its totally fine for a hostid to not be there.

Reported-by: Coverity (CID-1573336)

Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Ameer Hamza <ahamza@ixsystems.com>
Signed-off-by: Rob Norris <robn@despairlabs.com>
Closes openzfs#15650

cmd/zpool/zpool_main.c

@@ -3132,7 +3132,8 @@ zfs_force_import_required(nvlist_t *config)
 	 * local hostid.
 	 */
 	if (nvlist_lookup_uint64(nvinfo, ZPOOL_CONFIG_HOSTID, &hostid) != 0)
-		nvlist_lookup_uint64(config, ZPOOL_CONFIG_HOSTID, &hostid);
+		(void) nvlist_lookup_uint64(config, ZPOOL_CONFIG_HOSTID,
+		    &hostid);
 
 	if (state != POOL_STATE_EXPORTED && hostid != get_system_hostid())
 		return (B_TRUE);