Fix: Address a few benign memory leaks

This patch is the result of static analysis identifying a number of
memory leaks. The leaks are all benign as they are a result of not
deallocating memory in the desctructor. The fix still has value as it
removes false positives in the static analysis.

src/dev/arm/pl111.cc

@@ -84,6 +84,11 @@ Pl111::Pl111(const Params *p)
         vncserver->setFramebufferAddr(dmaBuffer);
 }
 
+Pl111::~Pl111()
+{
+    delete[] dmaBuffer;
+}
+
 // read registers and frame buffer
 Tick
 Pl111::read(PacketPtr pkt)

src/dev/arm/pl111.hh

@@ -316,6 +316,7 @@ class Pl111: public AmbaDmaDevice
         return dynamic_cast<const Params *>(_params);
     }
     Pl111(const Params *p);
+    ~Pl111();
 
     virtual Tick read(PacketPtr pkt);
     virtual Tick write(PacketPtr pkt);

src/dev/ethertap.cc

@@ -147,6 +147,7 @@ EtherTap::~EtherTap()
     if (buffer)
         delete [] buffer;
 
+    delete interface;
     delete listener;
 }
 

src/dev/i8254xGBe.cc

@@ -122,6 +122,11 @@ IGbE::IGbE(const Params *p)
     txFifo.clear();
 }
 
+IGbE::~IGbE()
+{
+    delete etherInt;
+}
+
 void
 IGbE::init()
 {
@@ -827,6 +832,8 @@ template<class T>
 IGbE::DescCache<T>::~DescCache()
 {
     reset();
+    delete[] fetchBuf;
+    delete[] wbBuf;
 }
 
 template<class T>

src/dev/i8254xGBe.hh

@@ -518,7 +518,7 @@ class IGbE : public EtherDevice
     }
 
     IGbE(const Params *params);
-    ~IGbE() {}
+    ~IGbE();
     virtual void init();
 
     virtual EtherInt *getEthPort(const std::string &if_name, int idx);

src/dev/ns_gige.cc

@@ -135,7 +135,9 @@ NSGigE::NSGigE(Params *p)
 }
 
 NSGigE::~NSGigE()
-{}
+{
+    delete interface;
+}
 
 /**
  * This is to write to the PCI general configuration registers