Rename fIH variable to fInvH

Change-Id: I742d684a6375f48f4612c9db7d12693b1813d778
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/292850
Commit-Queue: Michael Ludwig <michaelludwig@google.com>
Auto-Submit: Michael Ludwig <michaelludwig@google.com>
Reviewed-by: Weston Tracey <westont@google.com>
1 file changed