fix the case in the coeff quantizer where the coeffs were not quantized when the shift is zero

src/libFLAC/lpc.c

@@ -155,8 +155,7 @@ redo_it:
 		}
 	}
 
-	if(*shift != 0) { /* just to avoid wasting time... */
+	if(*shift >= 0) {
-		if(*shift > 0) {
 		for(i = 0; i < order; i++) {
 			qlp_coeff[i] = (FLAC__int32)floor((double)lp_coeff[i] * (double)(1 << *shift));
 
@@ -186,7 +185,7 @@ redo_it:
 			}
 		}
 	}
-	}
+
 	return 0;
 }