fix leaks

simgear/io/tcp_server.cxx

@@ -12,6 +12,7 @@ class TcpServer
 {
 public:
     TcpServer();
+    ~TcpServer();
     bool open();
     bool process();
     bool close();
@@ -25,6 +26,11 @@ TcpServer::TcpServer()
     channel = new SGSocket( "", "5500", "tcp" );
 }
 
+TcpServer::~Tcpserver()
+{
+    delete channel;
+}
+
 bool
 TcpServer::open()
 {

simgear/screen/screen-dump.cxx

@@ -55,6 +55,7 @@ bool sg_glWritePPMFile(const char *filename, GLubyte *buffer, int win_width, int
     ibuffer = (unsigned char *) malloc(win_width*win_height*RGB3);
 
     if ( (fp = fopen(filename, "wb")) == NULL ) {
+	free(ibuffer);
 	printf("Warning: cannot open %s\n", filename);
 	return false;
     }

simgear/timing/sg_time.cxx

@@ -122,11 +122,7 @@ SGTime::SGTime() {
 
 SGTime::~SGTime()
 {
-    if ( tzContainer != NULL ) {
-        SGTimeZoneContainer *tmp = tzContainer;
-        tzContainer = NULL;
-	delete tmp;
-    }
+    delete tzContainer;
 }