fix to use 'K_NULL' in KFieldInit(), KFieldSet() macros
fix to use 'K_NULL' in KFieldInit(), KFieldSet() macros

konoha-project/konoha3,konoha-project/konoha3,konoha-project/minikonoha,konoha-project/minikonoha,konoha-project/konoha3,konoha-project/minikonoha