tests/unit/tests/utils/utils_refcnt.c/utils_refcnt_register_zero_cb.c: fix typos
@@ -87,7 +87,7 @@ static void ocf_refcnt_register_zero_cb_test02(void **state)
expect_function_calls(zero_cb, 1);
expect_value(zero_cb, ctx, ptr);
- /* regiser callback */
+ /* register callback */
ocf_refcnt_register_zero_cb(&rc, zero_cb, ptr);
val = env_atomic_read(&rc.callback);
