[PATCH 1/3] constify arg for totals_add_rcu

[Eric Wong <e@80x24.org>]

It's not modified by that function, so constify it for
ease-of-reading and review.
---
 ext/mwrap/mwrap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ext/mwrap/mwrap.c b/ext/mwrap/mwrap.c
index 477b1cb..8592ea7 100644
--- a/ext/mwrap/mwrap.c
+++ b/ext/mwrap/mwrap.c
@@ -367,7 +367,7 @@ acc_stddev(const struct acc *acc)
 	return DBL2NUM(acc_stddev_dbl(acc));
 }
 
-static struct src_loc *totals_add_rcu(struct src_loc *k)
+static struct src_loc *totals_add_rcu(const struct src_loc *k)
 {
 	struct cds_lfht_iter iter;
 	struct cds_lfht_node *cur;