eina: fix eina_bench.c compilation error.

Summary:
When trying to compile eina_bench.c we get an error that say we didnt
defined the variables that EINA_ARRAY_ITER_NEXT. I defined them.
@fix

Reviewers: cedric

Subscribers: cedric

Differential Revision: https://phab.enlightenment.org/D1952

Signed-off-by: Cedric BAIL <cedric@osg.samsung.com>

src/benchmarks/eina/eina_bench.c

@@ -68,6 +68,10 @@ static void _mempool_shutdown(void)
    eina_module_list_free(_modules);
    if (_modules)
      {
+        Eina_Array_Iterator it;
+        char* module;
+        unsigned int i;
+
         EINA_ARRAY_ITER_NEXT(_modules, i, module, it)
           free(module);
         eina_array_free(_modules);