libmsc: support GSM 03.40 status report for nitb

This patch adds support for GSM 03.40 in nitb mode.

          MS         GSM 03.40          SMSC
           |                            |
           |         SMS-SUBMIT         |
           |--------------------------->|
           |     GSM 04.11 RP-ACK       |
           |<---------------------------|
           |         SMS-DELIVER        |
           |<---------------------------|
           |     GSM 04.11 RP-ACK       |
           |--------------------------->|
           |     SMS-STATUS-REPORT      |
           |<---------------------------|
           |     GSM 04.11 RP-ACK       |
           |--------------------------->|
           |                            |

Change-Id: I5cc7bb4ebadde0940f44d10c3df34707b0615160
diff --git a/src/libmsc/gsm_04_11.c b/src/libmsc/gsm_04_11.c
index 0a1348d..261e5cd 100644
--- a/src/libmsc/gsm_04_11.c
+++ b/src/libmsc/gsm_04_11.c
@@ -683,6 +683,11 @@
 		LOGP(DLSMS, LOGL_ERROR,
 		     "Failed to send status report! err=%d\n", rc);
 	}
+
+	/* No route via SMPP, send the GSM 03.40 status-report now. */
+	if (gsms->receiver)
+		gsm340_rx_sms_submit(sms_report);
+
 	LOGP(DLSMS, LOGL_NOTICE, "Status report has been sent\n");
 
 	sms_free(sms_report);