release particle sample array for complex particles

bfps/cpp/full_code/NSVEcomplex_particles.cpp

@@ -230,7 +230,7 @@ int NSVEcomplex_particles<rnumber>::do_stats()
 
     // deallocate temporary data array
     // TODO: is it required/safe to call the release method here?
-    //pdata.release();
+    pdata.release();
 
     return EXIT_SUCCESS;
 }