xdr_ypbind_setdom() would always fail because the test for
xdr_ypdomain_wrap_string() was reversed. Fixed this and in
the process made all the function tests to be of the form:
if (!xdr_foo())
return FALSE;
....
return TRUE;
instead of having some of them like above and others like:
if (xdr_foo() == FALSE)
return FALSE;
...
return xdr_bar();
this is more consistant now and hopefully in the future people
will pattern match correctly and not introduce spurious errors.