libnftnl: constify object arguments to various functions

flow table support needs constant object arguments to printing functions
to avoid ugly casts. While at it, also constify object arguments to message
construction, destructor and a few helper functions.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 3 insertions, 3 deletions

diff --git a/src/expr.c b/src/expr.c
index 16d40d6..ed07dc4 100644
--- a/src/expr.c
+++ b/src/expr.c
@@ -45,7 +45,7 @@ struct nftnl_expr *nftnl_expr_alloc(const char *name)
 }
 EXPORT_SYMBOL_ALIAS(nftnl_expr_alloc, nft_rule_expr_alloc);
 
-void nftnl_expr_free(struct nftnl_expr *expr)
+void nftnl_expr_free(const struct nftnl_expr *expr)
 {
 	if (expr->ops->free)
 		expr->ops->free(expr);
@@ -262,8 +262,8 @@ err1:
 	return NULL;
 }
 
-int nftnl_expr_snprintf(char *buf, size_t size, struct nftnl_expr *expr,
-			   uint32_t type, uint32_t flags)
+int nftnl_expr_snprintf(char *buf, size_t size, const struct nftnl_expr *expr,
+			uint32_t type, uint32_t flags)
 {
 	int ret;
 	unsigned int offset = 0, len = size;