detect extraneous bytes in the Sequences section

when nbSeq == 0.

Reported by @ip7z

tests/cli-tests/decompression/detectErrors.sh

@@ -0,0 +1,11 @@
+#!/bin/sh
+
+set -e
+
+GOLDEN_DIR="$ZSTD_REPO_DIR/tests/golden-decompression-errors/"
+
+for file in "$GOLDEN_DIR"/*; do
+    zstd -t $file && die "should have detected an error"
+done
+exit 0
+