CLEANUP: slz: Mark `reset_refs` as static
This function has no prototype and is not used outside of slz.c.
diff --git a/src/slz.c b/src/slz.c
index 9aacb9b..23912da 100644
--- a/src/slz.c
+++ b/src/slz.c
@@ -466,7 +466,7 @@
* be applied to 64-bit aligned data exclusively, which makes it slightly
* faster than the regular memset() since no alignment check is performed.
*/
-void reset_refs(union ref *refs, long count)
+static void reset_refs(union ref *refs, long count)
{
/* avoid a shift/mask by casting to void* */
union ref *end = (void *)refs + count;