Fixed fuzzer issue with lut16Type A2B ICC profiles

There was no check for if a profile had gamma table with 0 elements.
Now it verifies that the table has 2-4096 entries as the ICC specs say.

BUG=667695

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=5124

Change-Id: I36de202e398654ce8dd88e765455b4c4577724d2
Reviewed-on: https://skia-review.googlesource.com/5124
Reviewed-by: Matt Sarett <msarett@google.com>
Commit-Queue: Robert Aftias <raftias@google.com>
1 file changed