fix for warnings from Sparse static source code checker, mostly BKE/BLI and python functions.

- use NULL rather then 0 where possible (makes code & function calls more readable IMHO).
- set static variables and functions (exposed some unused vars/funcs).
- use func(void) rather then func() for definitions.

source/blender/python/intern/bpy_util.h

@@ -54,7 +54,7 @@ int BPY_class_validate(const char *class_type, PyObject *class, PyObject *base_c
 char *BPy_enum_as_string(struct EnumPropertyItem *item);
 
 
-#define BLANK_PYTHON_TYPE {PyVarObject_HEAD_INIT(NULL, 0) 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}
+#define BLANK_PYTHON_TYPE {PyVarObject_HEAD_INIT(NULL, 0) NULL}
 
 /* error reporting */
 short BPy_reports_to_error(struct ReportList *reports, const short clear);