db: log all incoming and outgoing messages

src/xmpp/message.c

@@ -508,7 +508,7 @@ message_send_chat_omemo(const char *const jid, uint32_t sid, GList *keys,
 }
 #endif
 
-void
+char*
 message_send_private(const char *const fulljid, const char *const msg, const char *const oob_url)
 {
     xmpp_ctx_t * const ctx = connection_get_ctx();
@@ -517,14 +517,14 @@ message_send_private(const char *const fulljid, const char *const msg, const cha
     xmpp_stanza_t *message = xmpp_message_new(ctx, STANZA_TYPE_CHAT, fulljid, id);
     xmpp_message_set_body(message, msg);
 
-    free(id);
-
     if (oob_url) {
         stanza_attach_x_oob_url(ctx, message, oob_url);
     }
 
     _send_message_stanza(message);
     xmpp_stanza_release(message);
+
+    return id;
 }
 
 char*