Fix crash in SampleCCPRGeometry

Fixes a crash introduced by 0e13db707ff3b384aaeb79cddc735967662f0ddf.

Change-Id: If250c57804705f35d11c1914efe5de2e6d5edb38
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/330936
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
1 file changed