one more stray Valgrind false positive
one more stray Valgrind false positive

Still reasoning through that bitfield one, but this is unrelated, and
exactly like the other version.  Clang may decide to branch on `0 ==
strcmp(kChromium, suffix)` before it branches on the result of `3 ==
sscanf(..., suffix)` that only has initialized suffix when it is true.

Change-Id: If76e7b9087b59ddae4249d9f2828c881fa649c8c
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/255418
Reviewed-by: Mike Klein <14574f09dfa9b4e14759b88c3426a495a0e627b0@google.com>
Reviewed-by: Ben Wagner aka dogben <3ef7217be91069877d94f7907ce5479000772cd3@google.com>
Commit-Queue: Mike Klein <14574f09dfa9b4e14759b88c3426a495a0e627b0@google.com>
Auto-Submit: Mike Klein <14574f09dfa9b4e14759b88c3426a495a0e627b0@google.com>

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