src: add xfree and use it

This patch adds xfree, a replacement of free that accepts
const pointers. This helps to remove ugly castings that you usually
need to calm down gcc.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/src/utils.c b/src/utils.c
index c6bf9ff..848eba9 100644
--- a/src/utils.c
+++ b/src/utils.c
@@ -168,3 +168,8 @@ int nft_str2verdict(const char *verdict)
 
 	return -1;
 }
+
+void xfree(const void *ptr)
+{
+	free((void *)ptr);
+}