fixed : frame concatenation without checksum

programs/playTests.sh

@@ -96,6 +96,13 @@ cat hello.zstd world.zstd > helloworld.zstd
 $ZSTD -dc helloworld.zstd > result.tmp
 cat result.tmp
 sdiff helloworld.tmp result.tmp
+$ECHO "frame concatenation without checksum"
+$ZSTD -c hello.tmp > hello.zstd --no-check
+$ZSTD -c world.tmp > world.zstd --no-check
+cat hello.zstd world.zstd > helloworld.zstd
+$ZSTD -dc helloworld.zstd > result.tmp
+cat result.tmp
+sdiff helloworld.tmp result.tmp
 rm ./*.tmp ./*.zstd
 $ECHO "frame concatenation tests completed"