Cleanup: deduplicate free code

It is more appropriate that `depths` is freed in `ED_view3d_depths_free`.

source/blender/editors/curve/editcurve_paint.c

@@ -624,7 +624,6 @@ static void curve_draw_exit(wmOperator *op)
 
     if (cdd->depths) {
       ED_view3d_depths_free(cdd->depths);
-      MEM_freeN(cdd->depths);
     }
     MEM_freeN(cdd);
     op->customdata = NULL;

source/blender/editors/object/object_transform.c

@@ -1687,7 +1687,6 @@ static void object_transform_axis_target_free_data(wmOperator *op)
 #ifdef USE_RENDER_OVERRIDE
   if (xfd->depths) {
     ED_view3d_depths_free(xfd->depths);
-    MEM_freeN(xfd->depths);
   }
 #endif
 

source/blender/editors/physics/particle_edit.c

@@ -525,7 +525,6 @@ static void PE_set_view3d_data(bContext *C, PEData *data)
   ED_view3d_viewcontext_init(C, &data->vc, data->depsgraph);
 
   if (!XRAY_ENABLED(data->vc.v3d)) {
-    if (!(data->vc.v3d->runtime.flag & V3D_RUNTIME_DEPTHBUF_OVERRIDDEN)) {
     ED_view3d_depth_override(data->depsgraph,
                              data->vc.region,
                              data->vc.v3d,
@@ -533,7 +532,6 @@ static void PE_set_view3d_data(bContext *C, PEData *data)
                              V3D_DEPTH_OBJECT_ONLY,
                              &data->depths);
   }
-  }
 }
 
 static bool PE_create_shape_tree(PEData *data, Object *shapeob)
@@ -577,7 +575,6 @@ static void PE_data_free(PEData *data)
   PE_free_shape_tree(data);
   if (data->depths) {
     ED_view3d_depths_free(data->depths);
-    MEM_freeN(data->depths);
     data->depths = NULL;
   }
 }

source/blender/editors/space_view3d/view3d_draw.c

@@ -2322,8 +2322,11 @@ void ED_view3d_depth_override(Depsgraph *depsgraph,
                               ViewDepths **r_depths)
 {
   if (v3d->runtime.flag & V3D_RUNTIME_DEPTHBUF_OVERRIDDEN) {
+    /* Force redraw if `r_depths` is required. */
+    if (!r_depths || *r_depths != NULL) {
       return;
     }
+  }
   struct bThemeState theme_state;
   Scene *scene = DEG_get_evaluated_scene(depsgraph);
   RegionView3D *rv3d = region->regiondata;
@@ -2365,6 +2368,9 @@ void ED_view3d_depth_override(Depsgraph *depsgraph,
     }
 
     if (r_depths) {
+      if (*r_depths) {
+        ED_view3d_depths_free(*r_depths);
+      }
       *r_depths = view3d_depths_create(region);
     }
   }
@@ -2384,6 +2390,7 @@ void ED_view3d_depths_free(ViewDepths *depths)
   if (depths->depths) {
     MEM_freeN(depths->depths);
   }
+  MEM_freeN(depths);
 }
 
 /** \} */

source/blender/editors/space_view3d/view3d_utils.c

@@ -1019,7 +1019,7 @@ static float view_autodist_depth_margin(ARegion *region, const int mval[2], int
   ViewDepths depth_temp = {0};
   view3d_depths_rect_create(region, &rect, &depth_temp);
   float depth_close = view3d_depth_near(&depth_temp);
-  ED_view3d_depths_free(&depth_temp);
+  MEM_SAFE_FREE(depth_temp.depths);
   return depth_close;
 }