Fix a few issues reported by static analyzers

src/xmpp/adhoc_commands_handler.cpp

@@ -29,7 +29,7 @@ const std::map<const std::string, const AdhocCommand>& AdhocCommandsHandler::get
   return this->commands;
 }
 
-XmlNode&& AdhocCommandsHandler::handle_request(const std::string& executor_jid, XmlNode command_node)
+XmlNode AdhocCommandsHandler::handle_request(const std::string& executor_jid, XmlNode command_node)
 {
   std::string action = command_node.get_tag("action");
   if (action.empty())
@@ -127,7 +127,7 @@ XmlNode&& AdhocCommandsHandler::handle_request(const std::string& executor_jid,
           command_node.add_child(std::move(error));
         }
     }
-  return std::move(command_node);
+  return command_node;
 }
 
 void AdhocCommandsHandler::remove_session(const std::string& session_id, const std::string& initiator_jid)

src/xmpp/adhoc_commands_handler.hpp

@@ -36,7 +36,7 @@ public:
    * Takes a copy of the <command/> node so we can actually edit it and use
    * it as our return value.
    */
-  XmlNode&& handle_request(const std::string& executor_jid, XmlNode command_node);
+  XmlNode handle_request(const std::string& executor_jid, XmlNode command_node);
   /**
    * Remove the session from the list. This is done to avoid filling the
    * memory with waiting session (for example due to a client that starts

src/xmpp/xmpp_component.cpp

@@ -286,7 +286,6 @@ void XmppComponent::handle_handshake(const Stanza& stanza)
   uint64_t usec;
   if (sd_watchdog_enabled(0, &usec) > 0)
     {
-      std::chrono::microseconds delay(usec);
       TimedEventsManager::instance().add_event(TimedEvent(
              std::chrono::duration_cast<std::chrono::milliseconds>(std::chrono::microseconds(usec / 2)),
              []() { sd_notify(0, "WATCHDOG=1"); }));

src/xmpp/xmpp_stanza.hpp

@@ -151,7 +151,7 @@ private:
 
 /**
  * An XMPP stanza is just an XML node of level 2 in the XMPP document (the
- * level 1 ones are the <stream::stream/>, and the ones about 2 are just the
+ * level 1 ones are the <stream::stream/>, and the ones above 2 are just the
  * content of the stanzas)
  */
 typedef XmlNode Stanza;