libmsc: add missing count of sms no receiver when using smpp_first

Change-Id: I20ecb3299d67dbaa7b016620685997db49970ffb
diff --git a/openbsc/src/libmsc/gsm_04_11.c b/openbsc/src/libmsc/gsm_04_11.c
index fba5208..840d4d4 100644
--- a/openbsc/src/libmsc/gsm_04_11.c
+++ b/openbsc/src/libmsc/gsm_04_11.c
@@ -309,8 +309,10 @@
 	if (!gsms->receiver) {
 #ifdef BUILD_SMPP
 		/* Avoid a second look-up */
-		if (smpp_first)
+		if (smpp_first) {
+			rate_ctr_inc(&conn->bts->network->ratectrs->ctr[MSC_CTR_SMS_NO_RECEIVER]);
 			return 1; /* cause 1: unknown subscriber */
+		}
 
 		rc = smpp_try_deliver(gsms, conn);
 		if (rc == 1) {