chore(gx): pool discard uses pool invalidate

src/gx/buffer/CGxPool.cpp

@@ -1,9 +1,12 @@
 #include "gx/buffer/CGxPool.hpp"
 
 void CGxPool::Discard() {
-    for (auto buf = this->m_bufList.Head(); buf; buf = this->m_bufList.Link(buf)->Next()) {
-        buf->unk1C = 0;
-    }
-
+    this->Invalidate();
     this->unk1C = 0;
 }
+
+void CGxPool::Invalidate() {
+    for (auto buf = this->m_bufList.Head(); buf; buf = this->m_bufList.Next(buf)) {
+        buf->unk1C = 0;
+    }
+}

src/gx/buffer/CGxPool.hpp

@@ -30,7 +30,8 @@ class CGxPool : public TSLinkedNode<CGxPool> {
             , m_hint(hint)
             , m_name(name)
             {};
-        void Discard(void);
+        void Discard();
+        void Invalidate();
 };
 
 #endif