Fix suboptimal flops

Signed-off-by: Jason Volk <jason@zemos.net>

src/database/sqlite/mod.rs

@@ -109,7 +109,7 @@ impl KeyValueDatabaseEngine for Arc<Engine> {
 			clippy::cast_sign_loss
 		)]
 		let cache_size_per_thread = ((config.db_cache_capacity_mb * 1024.0)
-			/ ((conduit::utils::available_parallelism() as f64 * 2.0) + 1.0)) as u32;
+			/ (conduit::utils::available_parallelism() as f64).mul_add(2.0, 1.0)) as u32;
 
 		let writer = Mutex::new(Engine::prepare_conn(&path, cache_size_per_thread)?);