zfs_arc plugin: constify

diff --git a/src/zfs_arc.c b/src/zfs_arc.c
index 1a7613c..515ed97 100644 (file)
--- a/src/zfs_arc.c
+++ b/src/zfs_arc.c
@@ -71,7 +71,7 @@ static int put_zfs_value (kstat_t *ksp, char const *k, value_t v)
        return 0;
 }
 
-static long long get_zfs_value(kstat_t *ksp, char *key)
+static long long get_zfs_value(kstat_t *ksp, const char *key)
 {
        llentry_t *e;
        value_t *v;