[8u20] Review request for RT-32213: Decoding BMP file throws an exception

[Vadim Pakhnushev]

Jim, Felipe, Kevin,
Please review a fix for this:

https://javafx-jira.kenai.com/browse/RT-32213
http://cr.openjdk.java.net/~vadim/RT-32213/webrev.00/

Thanks,
Vadim