gb: ns2_sns: Add missing value_string entry for GPRS_SNS_EV_NO_NSVC

Change-Id: Ifd4501676217f1a27f3ee02156be4e3dcb847703
diff --git a/src/gb/gprs_ns2_sns.c b/src/gb/gprs_ns2_sns.c
index 54ae77d..b2754f5 100644
--- a/src/gb/gprs_ns2_sns.c
+++ b/src/gb/gprs_ns2_sns.c
@@ -91,6 +91,7 @@
 	{ GPRS_SNS_EV_ADD,		"ADD" },
 	{ GPRS_SNS_EV_DELETE,		"DELETE" },
 	{ GPRS_SNS_EV_CHANGE_WEIGHT,	"CHANGE_WEIGHT" },
+	{ GPRS_SNS_EV_NO_NSVC,		"NO_NSVC" },
 	{ 0, NULL }
 };