Check scalar to fixed conversions with axes.

In SkTypeface_FreeType::Scanner::computeAxisValues, check for
out-of-range values before converting to SkFixed.

BUG=skia:4632
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1709403003

Review URL: https://codereview.chromium.org/1709403003
1 file changed