gnb,rlc_am_nr: fix generation of default AM NR configs

lib/src/asn1/rrc_nr_utils.cc

@@ -102,10 +102,11 @@ void make_mac_rach_cfg(const rach_cfg_common_s& asn1_type, rach_cfg_nr_t* rach_c
 
 int make_rlc_config_t(const rlc_cfg_c& asn1_type, uint8_t bearer_id, rlc_config_t* cfg_out)
 {
-  rlc_config_t rlc_cfg = rlc_config_t::default_rlc_um_nr_config();
+  rlc_config_t rlc_cfg = {};
   rlc_cfg.rat          = srsran_rat_t::nr;
   switch (asn1_type.type().value) {
     case rlc_cfg_c::types_opts::am:
+      rlc_cfg = rlc_config_t::default_rlc_am_nr_config();
       if (asn1_type.am().dl_am_rlc.sn_field_len_present && asn1_type.am().ul_am_rlc.sn_field_len_present &&
           asn1_type.am().dl_am_rlc.sn_field_len != asn1_type.am().ul_am_rlc.sn_field_len) {
         asn1::log_warning("NR RLC sequence number length is not the same in uplink and downlink");
@@ -126,6 +127,7 @@ int make_rlc_config_t(const rlc_cfg_c& asn1_type, uint8_t bearer_id, rlc_config_
       }
       break;
     case rlc_cfg_c::types_opts::um_bi_dir:
+      rlc_cfg                       = rlc_config_t::default_rlc_um_nr_config();
       rlc_cfg.rlc_mode              = rlc_mode_t::um;
       rlc_cfg.um_nr.t_reassembly_ms = asn1_type.um_bi_dir().dl_um_rlc.t_reassembly.to_number();
       rlc_cfg.um_nr.bearer_id       = bearer_id;