include: constify nlexpr field in location structure

The location shouldn't ever alter the expression.

And this fixes this compilation warning:

netlink_delinearize.c: In function ‘netlink_parse_expr’:
netlink_delinearize.c:1008:10: warning: assignment discards ‘const’ qualifier from pointer target type
  loc.nle = nle;
          ^
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/include/nftables.h b/include/nftables.h
index cf19de82..d3f471b7 100644
--- a/include/nftables.h
+++ b/include/nftables.h
@@ -52,7 +52,7 @@ struct location {
 			unsigned int		last_column;
 		};
 		struct {
-			void			*nle;
+			const void		*nle;
 		};
 	};
 };