Fix NULL dereference when using skcms to just do format conversion

Change-Id: Ida9652686f0d4674e82c9570b16c2e07fc21c08a
Reviewed-on: https://skia-review.googlesource.com/130028
Commit-Queue: Brian Osman <brianosman@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
Auto-Submit: Brian Osman <brianosman@google.com>
Reviewed-by: Mike Klein <mtklein@chromium.org>
1 file changed