gprs_ns2: add gprs_ns2_ip_vc_local() return the local sockaddr

Change-Id: I65a739772596015b90473045d32d4934d924e43f
diff --git a/src/gb/libosmogb.map b/src/gb/libosmogb.map
index ee8651e..f542496 100644
--- a/src/gb/libosmogb.map
+++ b/src/gb/libosmogb.map
@@ -93,6 +93,7 @@
 gprs_ns2_ip_connect2;
 gprs_ns2_ip_connect_inactive;
 gprs_ns2_ip_connect_sns;
+gprs_ns2_ip_vc_local;
 gprs_ns2_ip_vc_remote;
 gprs_ns2_is_frgre_bind;
 gprs_ns2_is_ip_bind;