Cleanup: Compilation warnings

Mainly -Wset-but-unused-variable.
Makes default compilation on macOS way less noisy.

Differential Revision: https://developer.blender.org/D14357

intern/dualcon/intern/octree.cpp

@@ -242,6 +242,10 @@ void Octree::printMemUsage()
 
   dc_printf("Total allocated bytes on disk: %d \n", totalbytes);
   dc_printf("Total leaf nodes: %d\n", totalLeafs);
+
+  /* Unused when not debuggining. */
+  (void)totalbytes;
+  (void)totalLeafs;
 }
 
 void Octree::resetMinimalEdges()