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Further simplications to compute_mdcts()

--- a/libcelt/celt.c

+++ b/libcelt/celt.c

@@ -253,7 +253,6 @@

       int N = mode->shortMdctSize<<LM;

       int B = 1;

       int b, c;

-      VARDECL(celt_word32, x);

       VARDECL(celt_word32, tmp);

       SAVE_STACK;

       if (shortBlocks)

@@ -262,7 +261,6 @@

          N = mode->shortMdctSize;

          B = shortBlocks;

       }

-      ALLOC(x, N+overlap, celt_word32);

       ALLOC(tmp, N, celt_word32);

       for (c=0;c<C;c++)

       {

@@ -269,9 +267,7 @@

          for (b=0;b<B;b++)

          {

             int j;

-            for (j=0;j<N+overlap;j++)

-               x[j] = in[(b*N+j)+c*(B*N+overlap)];

-            clt_mdct_forward(&mode->mdct, x, tmp, mode->window, overlap, shortBlocks ? mode->maxLM : mode->maxLM-LM);

+            clt_mdct_forward(&mode->mdct, in+c*(B*N+overlap)+b*N, tmp, mode->window, overlap, shortBlocks ? mode->maxLM : mode->maxLM-LM);

             /* Interleaving the sub-frames */

             for (j=0;j<N;j++)

                out[(j*B+b)+c*N*B] = tmp[j];