Fix decoding multiple ULSCH in the same slot in the case of a ULSCH fails to be detected
Fix decoding multiple ULSCH in the same slot in the case of a ULSCH fails to be detected and avoids the following assertion:
Assertion (harq_id >= 0) failed!
In nr_schedule_ulsch() /home/user/openairinterface5g/openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_ulsch.c:1589
no free HARQ process available for UE e441