[Ada] print null array pointer as 0x0' rather than (null)'

Trying to print a variable defined as an access to an unconstrained
array:

       type String_Access is access String;
       S1 : String_Access;

If that variable is null, then GDB prints its value in an odd way:

    (gdb) print S1
    $1 = (string_bug.string_access) (null)
                                    ^^^^^^

This patch changes the debugger behavior to print the pointer using
the same output we'd use for any null pointer:

    (gdb) print S1
    $1 = (string_bug.string_access) 0x0

It also adds an assert, helping us verify an assumption.

gdb/ChangeLog:

        * ada-valprint.c (ada_val_print_1): Print null array pointers as
        `0x0' rather than `(null)'.  Add assertion.

gdb/testsuite/ChangeLog:

        * gdb.ada/arrayptr/foo.adb: Add new local variable Null_String.
        * gdb.ada/arrayptr.exp: Add test printing that new variable.

gdb/ada-valprint.c

@@ -690,7 +690,8 @@ ada_val_print_1 (struct type *type, const gdb_byte *valaddr0,
 	val = ada_coerce_to_simple_array (val);
       if (val == NULL)
 	{
-	  fprintf_filtered (stream, "(null)");
+	  gdb_assert (TYPE_CODE (type) == TYPE_CODE_TYPEDEF);
+	  fprintf_filtered (stream, "0x0");
 	  retn = 0;
 	}
       else