lte,enb,sched: Fix hanging handover due to lack of Msg4.

srsenb/src/stack/mac/sched_ue_ctrl/sched_harq.cc

@@ -351,6 +351,9 @@ void harq_entity::reset()
   for (auto& h : ul_harqs) {
     for (uint32_t tb = 0; tb < SRSRAN_MAX_TB; tb++) {
       h.reset(tb);
+      // The reset_pending_data() is called after reset(), when generating PHICH. However, in the case of full HARQ
+      // reset (e.g. during handover) no PHICH is going to be generated.
+      h.reset_pending_data();
     }
   }
 }