Remove a useless call: Calling lineVec.dot(qPts[0])

This is from https://github.com/google/skia/pull/9, an external pull
request from https://github.com/sylvestre.

BUG=skia:
R=bsalomon
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2234563003

Review-Url: https://codereview.chromium.org/2234563003
1 file changed