Fixed a bunch of warnings

src/acpi/aml/dataobj.rs

src/acpi/aml/mod.rs

src/acpi/aml/namedobj.rs

src/acpi/aml/namespace.rs

src/acpi/aml/namespacemodifier.rs

src/acpi/aml/namestring.rs

src/acpi/aml/parser.rs

src/acpi/aml/termlist.rs

src/acpi/aml/type1opcode.rs

src/acpi/aml/type2opcode.rs

src/acpi/mod.rs

src/device/hpet.rs

src/device/mod.rs

src/start.rs