Skip useless compare to LONG_MAX in to_python(unsigned u)

As LONG_MAX is larger than any value representable by unsigned (int)
on most platforms, the test in the method do not make sense on these.
And 'unsigned long' can represent any value of unsigned int, so drop
the test.

Get rid of warning discovered with clang.

Author: petterreinholdtsen

src/hal/halmodule.cc

@@ -39,8 +39,7 @@ PyObject *to_python(bool b) {
     return PyBool_FromLong(b);
 }
 
-PyObject *to_python(unsigned u) {
-    if(u < LONG_MAX) return PyLong_FromLong(u);
+PyObject *to_python(unsigned int u) {
     return PyLong_FromUnsignedLong(u);
 }