don't clamp alpha, it's already [0,1]

No diffs.

Change-Id: I13a848955605a16aa229b98a14dc0e1930ba28c2
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/253721
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
1 file changed