Clean up some memory leaks

Move the  FFTW3 cleanup  into the  main routine as  it should  only be
called  once rather  than  every time  the  settings configuration  is
changed or reset (MultiSettings).

Call the new fini_ldpc_ routine before  exiting in the main routine to
free the LDPC resources.

git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@6764 ab8295b8-cf94-4d9e-aec4-7959e3be5d79

mainwindow.cpp

@@ -63,8 +63,6 @@ extern "C" {
   void symspec_(struct dec_data *, int* k, int* ntrperiod, int* nsps, int* ingain, int* minw,
                 float* px, float s[], float* df3, int* nhsym, int* npts8);
 
-  void four2a_(_Complex float *, int * nfft, int * ndim, int * isign, int * iform, int len);
-
   void hspec_(short int d2[], int* k, int* ingain, float green[], float s[], int* jh);
 
   void gen4_(char* msg, int* ichk, char* msgsent, int itone[],
@@ -832,16 +830,6 @@ MainWindow::~MainWindow()
   QString fname {QDir::toNativeSeparators(m_dataDir.absoluteFilePath ("wsjtx_wisdom.dat"))};
   QByteArray cfname=fname.toLocal8Bit();
   fftwf_export_wisdom_to_filename(cfname);
-  {
-    int nfft {-1};
-    int ndim {1};
-    int isign {1};
-    int iform {1};
-    // free FFT plan resources
-    four2a_ (nullptr, &nfft, &ndim, &isign, &iform, 0);
-  }
-  fftwf_forget_wisdom ();
-  fftwf_cleanup ();
   m_audioThread.quit ();
   m_audioThread.wait ();
 }