lib: hashing functions should take const arguments

It doesn't make much sense for a hash function to modify its argument,
so const the hash input.

BGP does it in a couple places, those cast away the const. Not great but
not any worse than it was.

Signed-off-by: Quentin Young <qlyoung@cumulusnetworks.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/pimd/pim_rpf.c b/pimd/pim_rpf.c
index afe3886aa5..dba46e63f0 100644
--- a/pimd/pim_rpf.c
+++ b/pimd/pim_rpf.c
@@ -426,9 +426,9 @@ int pim_rpf_is_same(struct pim_rpf *rpf1, struct pim_rpf *rpf2)
 	return 0;
 }
 
-unsigned int pim_rpf_hash_key(void *arg)
+unsigned int pim_rpf_hash_key(const void *arg)
 {
-	struct pim_nexthop_cache *r = (struct pim_nexthop_cache *)arg;
+	const struct pim_nexthop_cache *r = arg;
 
 	return jhash_1word(r->rpf.rpf_addr.u.prefix4.s_addr, 0);
 }