add missing native_to_java calls

Author: timfel

graalpython/com.oracle.graal.python.cext/src/dictobject.c

@@ -105,7 +105,7 @@ int PyDict_DelItemString(PyObject *d, const char *key) {
 }
 
 int PyDict_Update(PyObject *a, PyObject *b) {
-    PyObject* result = UPCALL_O(a, "update", b);
+    PyObject* result = UPCALL_O(native_to_java(a), "update", native_to_java(b));
     if (PyErr_Occurred()) {
         return -1;
     } else {

graalpython/com.oracle.graal.python.cext/src/moduleobject.c

@@ -125,5 +125,5 @@ PyObject* PyModule_GetDict(PyObject* o) {
 }
 
 PyObject* PyModule_NewObject(PyObject* name) {
-    return UPCALL_CEXT_O("PyModule_NewObject", name);
+    return UPCALL_CEXT_O("PyModule_NewObject", native_to_java(name));
 }

graalpython/com.oracle.graal.python.cext/src/sliceobject.c

@@ -84,5 +84,5 @@ Py_ssize_t PySlice_AdjustIndices(Py_ssize_t length, Py_ssize_t *start, Py_ssize_
 }
 
 PyObject* PySlice_New(PyObject* start, PyObject *stop, PyObject *step) {
-    return UPCALL_CEXT_O("PySlice_New", start, stop, step);
+    return UPCALL_CEXT_O("PySlice_New", native_to_java(start), native_to_java(stop), native_to_java(step));
 }