bsc: Rename core_ncc to core_mnc

Struct osmo_msc_data contains int core_ncc, which is actually the
MNC part of the PLMN, not to be confused with the Network Colour
Code.

The following patch renames this field for clarity and consistency
with the standards.
diff --git a/openbsc/src/osmo-bsc/osmo_bsc_api.c b/openbsc/src/osmo-bsc/osmo_bsc_api.c
index 5a01d6b..00a10b3 100644
--- a/openbsc/src/osmo-bsc/osmo_bsc_api.c
+++ b/openbsc/src/osmo-bsc/osmo_bsc_api.c
@@ -53,8 +53,8 @@
 
 static uint16_t get_network_code_for_msc(struct osmo_msc_data *msc)
 {
-	if (msc->core_ncc != -1)
-		return msc->core_ncc;
+	if (msc->core_mnc != -1)
+		return msc->core_mnc;
 	return msc->network->network_code;
 }
 
diff --git a/openbsc/src/osmo-bsc/osmo_bsc_filter.c b/openbsc/src/osmo-bsc/osmo_bsc_filter.c
index 58a57cd..6058d7e 100644
--- a/openbsc/src/osmo-bsc/osmo_bsc_filter.c
+++ b/openbsc/src/osmo-bsc/osmo_bsc_filter.c
@@ -313,7 +313,7 @@
 
 static int has_core_identity(struct osmo_msc_data *msc)
 {
-	if (msc->core_ncc != -1)
+	if (msc->core_mnc != -1)
 		return 1;
 	if (msc->core_mcc != -1)
 		return 1;
diff --git a/openbsc/src/osmo-bsc/osmo_bsc_msc.c b/openbsc/src/osmo-bsc/osmo_bsc_msc.c
index 773ee14..0eb3fa9 100644
--- a/openbsc/src/osmo-bsc/osmo_bsc_msc.c
+++ b/openbsc/src/osmo-bsc/osmo_bsc_msc.c
@@ -572,7 +572,7 @@
 	INIT_LLIST_HEAD(&msc_data->dests);
 	msc_data->ping_timeout = 20;
 	msc_data->pong_timeout = 5;
-	msc_data->core_ncc = -1;
+	msc_data->core_mnc = -1;
 	msc_data->core_mcc = -1;
 	msc_data->core_ci = -1;
 	msc_data->core_lac = -1;
diff --git a/openbsc/src/osmo-bsc/osmo_bsc_vty.c b/openbsc/src/osmo-bsc/osmo_bsc_vty.c
index 9a17cd0..8103ffc 100644
--- a/openbsc/src/osmo-bsc/osmo_bsc_vty.c
+++ b/openbsc/src/osmo-bsc/osmo_bsc_vty.c
@@ -110,9 +110,9 @@
 	if (msc->bsc_key_present)
 		vty_out(vty, " auth-key %s%s",
 			osmo_hexdump(msc->bsc_key, sizeof(msc->bsc_key)), VTY_NEWLINE);
-	if (msc->core_ncc != -1)
+	if (msc->core_mnc != -1)
 		vty_out(vty, " core-mobile-network-code %d%s",
-			msc->core_ncc, VTY_NEWLINE);
+			msc->core_mnc, VTY_NEWLINE);
 	if (msc->core_mcc != -1)
 		vty_out(vty, " core-mobile-country-code %d%s",
 			msc->core_mcc, VTY_NEWLINE);
@@ -261,10 +261,10 @@
 DEFUN(cfg_net_bsc_ncc,
       cfg_net_bsc_ncc_cmd,
       "core-mobile-network-code <1-999>",
-      "Use this network code for the core network\n" "NCC value\n")
+      "Use this network code for the core network\n" "MNC value\n")
 {
 	struct osmo_msc_data *data = osmo_msc_data(vty);
-	data->core_ncc = atoi(argv[0]);
+	data->core_mnc = atoi(argv[0]);
 	return CMD_SUCCESS;
 }