fix size of access_ue_list

the current UE list is zero-terminated (see e.g., the UE_iterator
macro).

openair2/LAYER2/NR_MAC_gNB/nr_mac_gNB.h

@@ -761,7 +761,7 @@ typedef struct {
   // last element always NULL
   pthread_mutex_t mutex;
   NR_UE_info_t *connected_ue_list[MAX_MOBILES_PER_GNB + 1];
-  NR_UE_info_t *access_ue_list[NR_NB_RA_PROC_MAX];
+  NR_UE_info_t *access_ue_list[NR_NB_RA_PROC_MAX + 1];
   // bitmap of CSI-RS already scheduled in current slot
   int sched_csirs;
   uid_allocator_t uid_allocator;