[OpenJDK 2D-Dev] RFR: 6243376: JPEGImageWriter corrupts color for non-JFIF images with differing sample factors

[Phil Race]

https://bugs.openjdk.java.net/browse/JDK-6243376
http://cr.openjdk.java.net/~prr/6243376/

One-line fix we should have done a long time ago.
The test was more work ..

-phil.