Still a crash in the rpcrt4 tests

[Paul Vriens]

Hi Rob,

There is still a crash in the rpcrt4 tests on NT4+.

These 2 tests both crash actually:

886   x = echo_ranged_int(0);
  887   ok(x == 0, "echo_ranged_int() returned %d instead of 0\n", x);
  888   x = echo_ranged_int(100);
  889   ok(x == 100, "echo_ranged_int() returned %d instead of 100\n", x);

but only in the "ncalrpc_basic" case.