Merge remote-tracking branch 'origin/3-digit-mnc-in-sib1' into integration_2024_w44 (!3073)

small fix for 3 digit mnc usage in sib1

When 3 digit MNC is used in PLMN, during preparation of SIB1, first
digit of MNC was not taking into account. UE derives Serving Network
Name (SNN) using PLMN info from sib1. Because of 5GCore and UE has
different SNNs, this leads to XRES*, RES* mismatch during Authentication
Procedure between 5GCore and UE. (SNN is used for derivation of these
keys)

openair2/RRC/NR/nr_rrc_config.c

@@ -2209,7 +2209,7 @@ NR_BCCH_DL_SCH_Message_t *get_SIB1_NR(const NR_ServingCellConfigCommon_t *scc,
     int mnc = plmn->mnc;
     if (plmn->mnc_digit_length == 3) {
       asn1cSequenceAdd(nr_plmn->mnc.list, NR_MCC_MNC_Digit_t, mnc0);
-      *mnc0 = (0 / 100) % 10;
+      *mnc0 = (mnc / 100) % 10;
     }
     asn1cSequenceAdd(nr_plmn->mnc.list, NR_MCC_MNC_Digit_t, mnc1);
     *mnc1 = (mnc / 10) % 10;