examples/spmv/dw_block_spmv.c: fix following #13213

examples/spmv/dw_block_spmv.c

@@ -2,7 +2,7 @@
  *
  * Copyright (C) 2009-2012, 2014  Université de Bordeaux 1
  * Copyright (C) 2010  Mehdi Juhoor <mjuhoor@gmail.com>
- * Copyright (C) 2010, 2011, 2012, 2013  Centre National de la Recherche Scientifique
+ * Copyright (C) 2010, 2011, 2012, 2013, 2014  Centre National de la Recherche Scientifique
  *
  * StarPU is free software; you can redistribute it and/or modify
  * it under the terms of the GNU Lesser General Public License as published by
@@ -318,7 +318,7 @@ int main(STARPU_ATTRIBUTE_UNUSED int argc,
 
 	double totalflop = 2.0*c*r*totaltasks;
 
-	double timing = (double)((end.tv_sec - start.tv_sec)*1000000 + (end.tv_usec - start.tv_usec));
+	double timing = end - start;
 	FPRINTF(stderr, "Computation took (in ms)\n");
 	FPRINTF(stdout, "%2.2f\n", timing/1000);
 	FPRINTF(stderr, "Flop %e\n", totalflop);