Fix hard-fault when socket created using accept() is deleted

When socket created  using accept() is deleted the destructor is called
on TCPSocket which in turn calls close() method which executes
"delete this". This causes hard-fault.

Set _factory_allocated to 0 in destructor call which effectively skips
"delete this" in a close method.

Author: sentinelt

features/netsocket/TCPSocket.cpp

@@ -24,6 +24,7 @@ TCPSocket::TCPSocket()
 
 TCPSocket::~TCPSocket()
 {
+    _factory_allocated = false;
     close();
 }
 

features/netsocket/UDPSocket.cpp

@@ -24,6 +24,7 @@ UDPSocket::UDPSocket()
 
 UDPSocket::~UDPSocket()
 {
+    _factory_allocated = false;
     close();
 }