[ox/std] Fix error handling for Result::copyTo

(synced from 9cc27f5be9)

src/ox/std/error.hpp

@@ -180,7 +180,9 @@ struct [[nodiscard]] Result {
 	}
 
 	constexpr Error copyTo(type &val) & noexcept {
-		*val = value;
+		if (!error) [[likely]] {
+			*val = value;
+		}
 		return error;
 	}