Delete spectseq on error conditions.

src/spectdisplay.cpp

 	if(stream.Ok() == FALSE)
 	{
 		wxLogError(_T("Failed to open '%s'"),filename.c_str());
+		delete spectseq;
 		return;
 	}
 	wxFileName path = wxFileName(filename);

src/spectseq.cpp

 /***************************************************************************
  *   Copyright (C) 2005 to 2007 by Jonathan Duddington                     *
  *   email: [email protected]                                    *
- *   Copyright (C) 2013 Reece H. Dunn                                      *
+ *   Copyright (C) 2013-2015 Reece H. Dunn                                 *
  *                                                                         *
  *   This program is free software; you can redistribute it and/or modify  *
  *   it under the terms of the GNU General Public License as published by  *