Fix bug in xtract_last_n()
Fix bug in xtract_last_n()

jamiebullock/LibXtract,eriser/LibXtract,kecsap/LibXtract,caseybasichis/LibXtract,caseybasichis/LibXtract,kecsap/LibXtract,jamiebullock/LibXtract,caseybasichis/LibXtract,jamiebullock/LibXtract,eriser/LibXtract,eriser/LibXtract,kecsap/LibXtract