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Don't flush the last buffered symbol if it is zero.

When rng starts out 0x80000000, this can cause an extra zero byte to be written
 to the stream.

--- a/libcelt/rangeenc.c

+++ b/libcelt/rangeenc.c

@@ -138,7 +138,7 @@

     }

   }

   /*If we have a buffered byte flush it into the output buffer.*/

-  if(_this->rem>=0||_this->ext>0){

+  if(_this->rem>0||_this->ext>0){

     ec_enc_carry_out(_this,0);

     _this->rem=-1;

   }