Fix for ec_enc_patch_initial_bits().
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.

oneman/opus-oneman,oneman/opus-oneman,oneman/opus-oneman