fix fuzz

src/pathops/SkPathOpsCommon.cpp

Index: src/pathops/SkPathOpsCommon.cpp
diff --git a/src/pathops/SkPathOpsCommon.cpp b/src/pathops/SkPathOpsCommon.cpp
index 52de8c1e07850678c14e9293556c622fb3889326..82b93f40727042e912b4e7f0c1ccfcfc4a201927 100644
--- a/src/pathops/SkPathOpsCommon.cpp
+++ b/src/pathops/SkPathOpsCommon.cpp
@@ -124,6 +124,9 @@ SkOpSegment* FindChase(SkTDArray<SkOpSpanBase*>* chase, SkOpSpanBase** startPtr,
         int winding;
         bool sortable;
         const SkOpAngle* angle = AngleWinding(*startPtr, *endPtr, &winding, &sortable);
+        if (!angle) {
+            return nullptr;
+        }
         if (winding == SK_MinS32) {
             continue;
         }