* ada-lang.c (decode_packed_array_type): Avoid a seg fault

    * ada-lang.c (decode_packed_array_type): Avoid a seg fault
        when the type is an anonymous pointer type.
        (ada_check_typedef): Avoid a seg fault when the type is null.
        * ada-typeprint.c (print_array_type): Add support for pointer
        to packed arrays.