Remove old incorrect comment

As discussed on the flac-dev mailing list.

Patch-from: lvqcl <lvqcl.mail@gmail.com>
diff --git a/src/libFLAC/stream_decoder.c b/src/libFLAC/stream_decoder.c
index 2e527aa..3bdd0f1 100644
--- a/src/libFLAC/stream_decoder.c
+++ b/src/libFLAC/stream_decoder.c
@@ -2705,9 +2705,6 @@
 	/* decode the subframe */
 	if(do_full_decode) {
 		memcpy(decoder->private_->output[channel], subframe->warmup, sizeof(FLAC__int32) * order);
-		/*@@@@@@ technically not pessimistic enough, should be more like
-		if( (FLAC__uint64)order * ((((FLAC__uint64)1)<<bps)-1) * ((1<<subframe->qlp_coeff_precision)-1) < (((FLAC__uint64)-1) << 32) )
-		*/
 		if(bps + subframe->qlp_coeff_precision + FLAC__bitmath_ilog2(order) <= 32)
 			if(bps <= 16 && subframe->qlp_coeff_precision <= 16)
 				decoder->private_->local_lpc_restore_signal_16bit(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, subframe->qlp_coeff, order, subframe->quantization_level, decoder->private_->output[channel]+order);