avcodec: use correct buffer size in fill_audio_frame

modules/codec/avcodec/encoder.c

@@ -1188,7 +1188,7 @@ static block_t *EncodeAudio( encoder_t *p_enc, block_t *p_aout_buf )
         }
         if( avcodec_fill_audio_frame( p_sys->frame, p_sys->p_context->channels,
                 p_sys->p_context->sample_fmt, p_sys->b_planar ? p_sys->p_interleave_buf : p_sys->p_buffer,
-                leftover + buffer_delay,
+                p_sys->i_buffer_out,
                 align) < 0 )
         {
             msg_Err( p_enc, "filling error on fillup" );