Remove an unused local variable.

This commit was SVN r22566.

ompi/mca/coll/tuned/coll_tuned_module.c

@@ -172,7 +172,7 @@ static int
 tuned_module_enable( mca_coll_base_module_t *module,
                      struct ompi_communicator_t *comm )
 {
-    int size, i;
+    int size;
     mca_coll_tuned_module_t *tuned_module = (mca_coll_tuned_module_t *) module;
     mca_coll_tuned_comm_t *data = NULL;