Fix array delete and header guard (sonic-net#1327)

Author: qiluo-msft

fpmsyncd/fpmlink.cpp

@@ -61,7 +61,7 @@ FpmLink::FpmLink(unsigned short port) :
 
 FpmLink::~FpmLink()
 {
-    delete m_messageBuffer;
+    delete[] m_messageBuffer;
     if (m_connected)
         close(m_connection_socket);
     if (m_server_up)

mclagsyncd/mclaglink.cpp

@@ -632,8 +632,8 @@ MclagLink::MclagLink(int port) :
 
 MclagLink::~MclagLink()
 {
-    delete m_messageBuffer;
-    delete m_messageBuffer_send;
+    delete[] m_messageBuffer;
+    delete[] m_messageBuffer_send;
     if (m_connected)
         close(m_connection_socket);
     if (m_server_up)

orchagent/notifications.h

@@ -1,3 +1,5 @@
+#pragma once
+
 extern "C" {
 #include "sai.h"
 }

orchagent/notifier.h

@@ -1,3 +1,5 @@
+#pragma once
+
 #include "orch.h"
 
 class Notifier : public Executor {

tests/mock_tests/mock_table.h

@@ -1,3 +1,5 @@
+#pragma once
+
 #include "table.h"
 
 namespace testing_db