gprs_ns2: add value_string for GPRS_NS2_AFF_CAUSE_SNS_NO_ENDPOINTS

Change-Id: I7c9245be248cb8697a370f80021612c14efa5cbb
diff --git a/src/gb/gprs_ns2.c b/src/gb/gprs_ns2.c
index 3e023ca..c48575b 100644
--- a/src/gb/gprs_ns2.c
+++ b/src/gb/gprs_ns2.c
@@ -217,6 +217,7 @@
 	{ GPRS_NS2_AFF_CAUSE_RECOVERY,		"NSE recovery" },
 	{ GPRS_NS2_AFF_CAUSE_SNS_CONFIGURED,	"NSE SNS configured" },
 	{ GPRS_NS2_AFF_CAUSE_SNS_FAILURE,	"NSE SNS failure" },
+	{ GPRS_NS2_AFF_CAUSE_SNS_NO_ENDPOINTS,	"NSE SNS no endpoints"},
 	{ GPRS_NS2_AFF_CAUSE_MTU_CHANGE,	"NSE MTU changed" },
 	{ 0, NULL }
 };