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Fix for ec_enc_patch_initial_bits().

The test to make sure that _nbits had been encoded was checking for
 8-_nbits instead of _nbits.
This only affected cases when less than 8 bits had ever been
 encoded by the time the initial bits were patched.

--- a/celt/entenc.c

+++ b/celt/entenc.c

@@ -225,7 +225,7 @@

     /*The first byte is still awaiting carry propagation.*/

     _this->rem=(_this->rem&~mask)|_val<<shift;

   }

-  else if(_this->rng<=(EC_CODE_TOP>>shift)){

+  else if(_this->rng<=(EC_CODE_TOP>>_nbits)){

     /*The renormalization loop has never been run.*/

     _this->val=(_this->val&~((opus_uint32)mask<<EC_CODE_SHIFT))|

      (opus_uint32)_val<<(EC_CODE_SHIFT+shift);