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Minor FFT cleanups.

Remove a redundant include and some dead stores.

Patch by Aurélien Zanelli <[email protected]>.

--- a/celt/kiss_fft.c

+++ b/celt/kiss_fft.c

@@ -40,7 +40,6 @@

 #include "os_support.h"

 #include "mathops.h"

 #include "stack_alloc.h"

-#include "os_support.h"

 /* The guts header contains all the multiplication and addition macros that are defined for

    complex numbers.  It also delares the kf_ internal functions.

@@ -142,8 +141,6 @@

          C_ADDTO(*Fout, scratch[1]);

          C_ADD( scratch[3] , scratch[0] , scratch[2] );

          C_SUB( scratch[4] , scratch[0] , scratch[2] );

-         Fout[m2].r = PSHR32(Fout[m2].r, 2);

-         Fout[m2].i = PSHR32(Fout[m2].i, 2);

          C_SUB( Fout[m2], *Fout, scratch[3] );

          tw1 += fstride;

          tw2 += fstride*2;