hg: jdk9/client/jdk: 6294607: GIFWriter returns the same compression type twice

[jayathirth.d.v at oracle.com]

Changeset: 557da3953b0b
Author:    jdv
Date:      2016-10-13 11:37 +0530
URL:       http://hg.openjdk.java.net/jdk9/client/jdk/rev/557da3953b0b

6294607: GIFWriter returns the same compression type twice
Reviewed-by: prr, serb, bpb

! src/java.desktop/share/classes/com/sun/imageio/plugins/gif/GIFImageWriter.java
+ test/javax/imageio/ImageCompressionTypesTest.java