Don't under-allocate curve tessellation triangles

Fixes a bug introduced by 2758a3189ade49d228e76963d842ade8e83b24ee.
This probably isn't a big deal since when a path has 1 verb, the 1
verb is kMove and it's empty anyway, but this change is probably best
for the sake of correctness.

TBR=robertphillips@google.com

Change-Id: I73f7d199b19c7d8adc8d73efb7eac1a3d2fbd3be
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/410935
Reviewed-by: Chris Dalton <csmartdalton@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
1 file changed