hg: jdk/client: 6532025: GIF reader throws misleading exception with truncated images

[jayathirth.d.v at oracle.com]

Changeset: c4d580d1305a
Author:    jdv
Date:      2020-03-10 16:07 +0530
URL:       https://hg.openjdk.java.net/jdk/client/rev/c4d580d1305a

6532025: GIF reader throws misleading exception with truncated images
Reviewed-by: prr, bpb

! src/java.desktop/share/classes/com/sun/imageio/plugins/gif/GIFImageReader.java
+ test/jdk/javax/imageio/plugins/gif/TruncatedGIFTest.java