Issue #5933: Fix some gcc -Wextra warnings. Thanks Victor Stinner for

the patch.

Modules/_ctypes/cfield.c

@@ -372,7 +372,7 @@ get_ulong(PyObject *v, unsigned long *p)
 		return -1;
 	}
 	x = PyInt_AsUnsignedLongMask(v);
-	if (x == -1 && PyErr_Occurred())
+	if (x == (unsigned long)-1 && PyErr_Occurred())
 		return -1;
 	*p = x;
 	return 0;
@@ -410,7 +410,7 @@ get_ulonglong(PyObject *v, unsigned PY_LONG_LONG *p)
  		return -1;
  	}
 	x = PyInt_AsUnsignedLongLongMask(v);
-	if (x == -1 && PyErr_Occurred())
+	if (x == (unsigned PY_LONG_LONG)-1 && PyErr_Occurred())
 		return -1;
 	*p = x;
 	return 0;

Modules/_randommodule.c

@@ -355,7 +355,7 @@ random_setstate(RandomObject *self, PyObject *state)
 
 	for (i=0; i<N ; i++) {
 		element = PyLong_AsUnsignedLong(PyTuple_GET_ITEM(state, i));
-		if (element == -1 && PyErr_Occurred())
+		if (element == (unsigned long)-1 && PyErr_Occurred())
 			return NULL;
 		self->state[i] = element & 0xffffffffUL; /* Make sure we get sane state */
 	}