Forgot a case in which we should check is the checkpoint is ready during the

threaded CR builds. MTT caught this by running the IU FT CR test 'inflight'
which under certian timing scenarios will trigger this.

This commit was SVN r17538.

opal/threads/condition.h

@@ -84,6 +84,7 @@ static inline int opal_condition_wait(opal_condition_t *c, opal_mutex_t *m)
             c->c_waiting--;
             opal_mutex_unlock(m);
             opal_progress();
+            OPAL_CR_TEST_CHECKPOINT_READY_STALL();
             opal_mutex_lock(m);
             return 0;
         }