OutputStream: Do not prefix hex numbers with 0x

src/os/object/outputstream.cc

@@ -59,8 +59,9 @@ OutputStream & OutputStream::operator<<(unsigned long long number)
 		put('0');
 		break;
 	case 16:
-		put('0');
-		put('x');
+		if (number < 16) {
+			put('0');
+		}
 		break;
 	}