Remove only UEs belonging to DU that disconnected

The previous condition was wrong: if a UE did not have the assoc_id of
the DU that connected (i.e., it was connected to another DU then the one
disconnecting), it was marked for deletion. Instead, skip those UEs.

openair2/RRC/NR/rrc_gNB_du.c

@@ -457,7 +457,9 @@ static int invalidate_du_connections(gNB_RRC_INST *rrc, sctp_assoc_t assoc_id)
       nr_rrc_finalize_ho(UE);
     }
     f1_ue_data_t ue_data = cu_get_f1_ue_data(ue_id);
-    if (ue_data.du_assoc_id == assoc_id && IS_SA_MODE(get_softmodem_params())) {
+    if (ue_data.du_assoc_id != assoc_id)
+      continue; /* this UE is on another DU */
+    if (IS_SA_MODE(get_softmodem_params())) {
       /* this UE belongs to the DU that disconnected, set du_assoc_id to 0,
        * meaning DU is offline, then trigger release request */
       ue_data.du_assoc_id = 0;