examples: remove double variable declaration

examples/basic_examples/variable.c

@@ -74,7 +74,6 @@ int main(int argc, char **argv)
 	for (i = 0; i < niter; i++)
 	{
 		struct starpu_task *task = starpu_task_create();
-                int ret;
 
 		task->cl = &cl;
 

examples/filters/fblock.c

@@ -138,7 +138,7 @@ int main(int argc, char **argv)
         /* Submit a task on each sub-block */
         for(i=0 ; i<starpu_data_get_nb_children(handle) ; i++)
         {
-                int ret,multiplier=i;
+                int multiplier=i;
                 struct starpu_task *task = starpu_task_create();
 
                 FPRINTF(stderr,"Dealing with sub-block %d\n", i);

examples/reductions/minmax_reduction.c

@@ -180,7 +180,7 @@ int main(int argc, char **argv)
 		task->handles[0] = x_handles[block];
 		task->handles[1] = minmax_handle;
 
-		int ret = starpu_task_submit(task);
+		ret = starpu_task_submit(task);
 		if (ret)
 		{
 			STARPU_ASSERT(ret == -ENODEV);