[MotionMark] The text "kkkj" is causing Firefox console warning: `unreachable code after return statement`
https://bugs.webkit.org/show_bug.cgi?id=196814

Reviewed by Wenson Hsieh.

* MotionMark/resources/extensions.js:
(subtract.subtract.sampleY):
Websites/browserbench.org:

* MotionMark1.1/resources/extensions.js:
(subtract.subtract.sampleY):


Canonical link: https://commits.webkit.org/211244@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@244357 268f45cc-cd09-0410-ab3c-d52691b4dbfc