[sms] Send a notification on incoming SMS

Further tests of the signal class. Send a notification
on incoming SMS.
diff --git a/src/gsm_04_11.c b/src/gsm_04_11.c
index b0d3a01..d354663 100644
--- a/src/gsm_04_11.c
+++ b/src/gsm_04_11.c
@@ -36,6 +36,7 @@
 #include <openbsc/gsm_04_11.h>
 #include <openbsc/gsm_04_08.h>
 #include <openbsc/abis_rsl.h>
+#include <openbsc/signal.h>
 
 #define GSM411_ALLOC_SIZE	1024
 #define GSM411_ALLOC_HEADROOM	128
@@ -118,6 +119,15 @@
 			"UserData: \"%s\"\n", sms->mti, sms->vpf, sms->msg_ref,
 			sms->pid, sms->dcs, sms->ud_len, sms->user_data);
 
+	struct sms_signal_data sig = {
+		.data = {
+			.area   = S_SMS,
+		},
+
+		.sms = sms,
+	};
+	dispatch_signal(&sig.data);
+
 	free(sms);
 
 	return 0;