Avoid gNB to exit when UE release or becomes out of coverage

openair2/LAYER2/nr_rlc/nr_rlc_oai_api.c

@@ -385,7 +385,6 @@ rlc_op_status_t rlc_data_req     (const protocol_ctxt_t *const ctxt_pP,
     rb->recv_sdu(rb, (char *)sdu_pP->data, sdu_sizeP, muiP);
   } else {
     LOG_E(RLC, "%s:%d:%s: fatal: SDU sent to unknown RB\n", __FILE__, __LINE__, __FUNCTION__);
-    exit(1);
   }
 
   nr_rlc_manager_unlock(nr_rlc_ue_manager);