fix msan bug in pathops

Msan and Valgrind found an uninitialized memory mistake in
pathops. This also fixes similar bugs where not all parts
of the geometry were covered in the loop iteration.

R=borenet@google.com
NOTREECHECKS=true
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2366893003

Review-Url: https://codereview.chromium.org/2366893003
diff --git a/tests/PathOpsOpTest.cpp b/tests/PathOpsOpTest.cpp
index 9bb3a0f..92ef105 100644
--- a/tests/PathOpsOpTest.cpp
+++ b/tests/PathOpsOpTest.cpp
@@ -7990,12 +7990,10 @@
 }
 
 static struct TestDesc repTests[] = {
-    TEST(loops44i),
-    TEST(loops45i),
-    TEST(loops46i),
+    TEST(fuzz763_5a),
 };
 
 DEF_TEST(PathOpsRepOp, reporter) {
-  for (int index = 0; index < 2; ++index)
+  for (int index = 0; index < 1; ++index)
     RunTestSet(reporter, repTests, SK_ARRAY_COUNT(repTests), nullptr, nullptr, nullptr, false);
 }