[dbusproxy] Set reply message when method call is successfully handled

Method call message dispatching logic assumes that something went wrong
if handler callback does not provide reply message and sends a generic
error reply. Some handlers never fill in reply and this causes false
negative error replies to be sent to clients.

Return empty reply message even if handler does not have any specific
value to return to avoid confusion at client end.

Signed-off-by: Simo Piiroinen <simo.piiroinen@jolla.com>

modules/dbusproxy.c

@@ -101,6 +101,7 @@ static void req_powerup(const DsmeDbusMessage* request, DsmeDbusMessage** reply)
 
   DSM_MSGTYPE_POWERUP_REQ req = DSME_MSG_INIT(DSM_MSGTYPE_POWERUP_REQ);
   modules_broadcast_internally(&req);
+  *reply = dsme_dbus_reply_new(request);
 }
 
 static void req_reboot(const DsmeDbusMessage* request, DsmeDbusMessage** reply)
@@ -113,6 +114,7 @@ static void req_reboot(const DsmeDbusMessage* request, DsmeDbusMessage** reply)
 
   DSM_MSGTYPE_REBOOT_REQ req = DSME_MSG_INIT(DSM_MSGTYPE_REBOOT_REQ);
   modules_broadcast_internally(&req);
+  *reply = dsme_dbus_reply_new(request);
 }
 
 static void req_shutdown(const DsmeDbusMessage* request,
@@ -127,6 +129,7 @@ static void req_shutdown(const DsmeDbusMessage* request,
   DSM_MSGTYPE_SHUTDOWN_REQ req = DSME_MSG_INIT(DSM_MSGTYPE_SHUTDOWN_REQ);
 
   modules_broadcast_internally(&req);
+  *reply = dsme_dbus_reply_new(request);
 }
 
 /** Flag for: dbus broadcast info has been installed */