code lu: fix error calc

codes/lu/lu.c

@@ -85,7 +85,7 @@ void calc_error(int n,
 		 DATA_TYPE POLYBENCH_2D(A,N,N,n,n))
 {
     int i;
-    int num = n;
+    int num = n*n;
     double err = 0;
     double *accurate = &_binary_data_bin_start;
     double *test = &(A[0][0]);