qbsp: tidy FreeBrushes

include/qbsp/brush.hh

@@ -42,7 +42,7 @@ int Brush_ListCount(const brush_t *brush);
 int Brush_NumFaces(const brush_t *brush);
 
 brush_t *LoadBrush(const mapbrush_t *mapbrush, const vec3_t rotate_offset, const int hullnum);
-void FreeBrushes(brush_t *brushlist);
+void FreeBrushes(mapentity_t *ent);
 
 int FindPlane(const vec3_t normal, const vec_t dist, int *side);
 bool PlaneEqual(const qbsp_plane_t *p1, const qbsp_plane_t *p2);

qbsp/brush.cc

@@ -508,15 +508,16 @@ FreeBrushes
 =====================
 */
 void
-FreeBrushes(brush_t *brushlist)
+FreeBrushes(mapentity_t *ent)
 {
     brush_t *brush, *next;
 
-    for (brush = brushlist; brush; brush = next) {
+    for (brush = ent->brushes; brush; brush = next) {
         next = brush->next;
         FreeBrushFaces(brush->faces);
         FreeMem(brush, BRUSH, 1);
     }
+    ent->brushes = nullptr;
 }
 
 /*

qbsp/qbsp.cc

@@ -153,8 +153,7 @@ ProcessEntity(mapentity_t *entity, const int hullnum)
      * leaving a perfect skin of the model with no hidden faces
      */
     surfs = CSGFaces(entity);
-    FreeBrushes(entity->brushes);
-
+    
     if (options.fObjExport && entity == pWorldEnt() && hullnum == 0) {
         ExportObj(surfs);
     }
@@ -232,6 +231,8 @@ ProcessEntity(mapentity_t *entity, const int hullnum)
         ExportDrawNodes(entity, nodes, firstface);
     }
 
+    FreeBrushes(entity);
+    
     map.cTotal[LUMP_MODELS]++;
 }
 
@@ -503,7 +504,7 @@ static void BSPX_CreateBrushList(void)
                 }
 
                 BSPX_Brushes_AddModel(&ctx, modelnum , ent->brushes);
-                FreeBrushes(ent->brushes);
+                FreeBrushes(ent);
         }
 
         BSPX_Brushes_Finalize(&ctx);