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libvorbis: fix free() called on a wrong pointer

--- a/sys/src/cmd/audio/libvorbis/mdct.c

+++ b/sys/src/cmd/audio/libvorbis/mdct.c

@@ -495,7 +495,7 @@

   int n4=n>>2;

   int n8=n>>3;

   DATA_TYPE *w=malloc(n*sizeof(*w)); /* forward needs working space */

-  DATA_TYPE *w2=w+n2;

+  DATA_TYPE *w2=w+n2, *wbuf=w;

   /* rotate */

@@ -559,5 +559,5 @@

     w+=2;

     T+=2;

   }

-  free(w);

+  free(wbuf);

 }