repo: remove now-incorrect comment

rust-bindings/rust/libostree/src/repo.rs

@@ -13,7 +13,6 @@ use ObjectName;
 
 unsafe extern "C" fn read_variant_table(_key: glib_ffi::gpointer, value: glib_ffi::gpointer, hash_set: glib_ffi::gpointer) {
     let value: glib::Variant = from_glib_none(value as *const glib_ffi::GVariant);
-    // TODO: this set is degenerate because g_variant_hash for my Variants is always 0
     let set: &mut HashSet<ObjectName> = &mut *(hash_set as *mut HashSet<ObjectName>);
     set.insert(ObjectName::new(value));
 }