RNA API: use bool's for enum itemf callbacks.

source/blender/python/intern/bpy_props.c

@@ -1430,7 +1430,7 @@ static EnumPropertyItem *enum_items_from_py(PyObject *seq_fast, PyObject *def, i
 	return items;
 }
 
-static EnumPropertyItem *bpy_prop_enum_itemf_cb(struct bContext *C, PointerRNA *ptr, PropertyRNA *prop, int *free)
+static EnumPropertyItem *bpy_prop_enum_itemf_cb(struct bContext *C, PointerRNA *ptr, PropertyRNA *prop, bool *r_free)
 {
 	PyGILState_STATE gilstate;
 
@@ -1483,7 +1483,7 @@ static EnumPropertyItem *bpy_prop_enum_itemf_cb(struct bContext *C, PointerRNA *
 	}
 
 	if (err != -1) { /* worked */
-		*free = 1;
+		*r_free = true;
 	}
 	else {
 		printf_func_error(py_func);

source/blender/python/intern/bpy_rna.c

@@ -1126,7 +1126,7 @@ static const char *pyrna_enum_as_string(PointerRNA *ptr, PropertyRNA *prop)
 {
 	EnumPropertyItem *item;
 	const char *result;
-	int free = false;
+	bool free = false;
 
 	RNA_property_enum_items(BPy_GetContext(), ptr, prop, &item, NULL, &free);
 	if (item) {
@@ -1205,7 +1205,7 @@ static int pyrna_prop_to_enum_bitfield(PointerRNA *ptr, PropertyRNA *prop, PyObj
 {
 	EnumPropertyItem *item;
 	int ret;
-	int free = false;
+	bool free = false;
 
 	*r_value = 0;
 
@@ -1285,7 +1285,7 @@ static PyObject *pyrna_enum_to_py(PointerRNA *ptr, PropertyRNA *prop, int val)
 		}
 		else {
 			EnumPropertyItem *enum_item;
-			int free = false;
+			bool free = false;
 
 			/* don't throw error here, can't trust blender 100% to give the
 			 * right values, python code should not generate error for that */