ns2: Add gprs_ns2_nsvc_state_name() to get the current state of a VC

Change-Id: I4c4c5b9142d7240ed452218e263ba12e2b70d1a0
Related: SYS#4998
diff --git a/include/osmocom/gprs/gprs_ns2.h b/include/osmocom/gprs/gprs_ns2.h
index ffc2ad8..728ca9f 100644
--- a/include/osmocom/gprs/gprs_ns2.h
+++ b/include/osmocom/gprs/gprs_ns2.h
@@ -192,9 +192,12 @@
 		struct gprs_ns2_nse *nse,
 		const struct osmo_sockaddr *sockaddr);
 void gprs_ns2_start_alive_all_nsvcs(struct gprs_ns2_nse *nse);
+
+/* VC information */
 const char *gprs_ns2_ll_str(struct gprs_ns2_vc *nsvc);
 char *gprs_ns2_ll_str_buf(char *buf, size_t buf_len, struct gprs_ns2_vc *nsvc);
 char *gprs_ns2_ll_str_c(const void *ctx, struct gprs_ns2_vc *nsvc);
+const char *gprs_ns2_nsvc_state_name(struct gprs_ns2_vc *nsvc);
 
 /* vty */
 int gprs_ns2_vty_init(struct gprs_ns2_inst *nsi,