paging: Handle the possible OOM message as well.

openbsc/src/silent_call.c

@@ -60,6 +60,7 @@ static int paging_cb_silent(unsigned int hooknum, unsigned int event,
 		break;
 	case GSM_PAGING_EXPIRED:
 	case GSM_PAGING_BUSY:
+	case GSM_PAGING_OOM:
 		DEBUGP(DSMS, "expired\n");
 		dispatch_signal(SS_SCALL, S_SCALL_EXPIRED, &sigdata);
 		break;