fix RLC mode printf and timer access

lib/src/upper/rlc.cc

@@ -440,7 +440,7 @@ void rlc::add_bearer(uint32_t lcid, srslte_rlc_config_t cnfg)
       rlc_log->error("Error instantiating RLC\n");
       goto delete_and_exit;
     }
-    rlc_log->warning("Added radio bearer %s with mode %s\n", rrc->get_rb_name(lcid).c_str(), liblte_rrc_rlc_mode_text[cnfg.rlc_mode]);
+    rlc_log->warning("Added radio bearer %s in %s\n", rrc->get_rb_name(lcid).c_str(), rlc_mode_text[cnfg.rlc_mode]);
     goto unlock_and_exit;
   } else {
     rlc_log->warning("Bearer %s already created.\n", rrc->get_rb_name(lcid).c_str());

lib/src/upper/rlc_am.cc

@@ -979,7 +979,9 @@ void rlc_am::rlc_am_tx::handle_control_pdu(uint8_t *payload, uint32_t nof_bytes)
 
   log->info("%s Rx Status PDU: %s\n", RB_NAME, rlc_am_to_string(&status).c_str());
 
-  poll_retx_timer->reset();
+  if (poll_retx_timer) {
+    poll_retx_timer->reset();
+  }
 
   // flush retx queue to avoid unordered SNs, we expect the Rx to request lost PDUs again
   if (status.N_nack > 0) {