fix parentheses warning

Bug: skia:11786
Change-Id: I2ded1f1cbd486e1710f1ebbb326844258cfeac64
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/392436
Reviewed-by: Brian Salomon <bsalomon@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
1 file changed