message: [OMPT] Fix tool initialization returning 0
  If tool initialization returns 0, OMPT should not be active. The current
  implementation provided some callback invocations in this case.
diff: @@ -332,6 +332,12 @@ void ompt_post_init() {
  ompt_enabled.enabled = !!ompt_start_tool_result->initialize(
  ompt_fn_lookup, &(ompt_start_tool_result->tool_data));
  + if (!ompt_enabled.enabled) {
  + // tool not enabled, zero out the bitmap, and done
  + memset(&ompt_enabled, 0, sizeof(ompt_enabled));
  + return;
  + }
  +
  ompt_thread_t *root_thread = ompt_get_thread();
  ompt_set_thread_state(root_thread, omp_state_overhead);
  