fix pathops coincidence fuzz bug

src/pathops/SkOpCoincidence.cpp

Index: src/pathops/SkOpCoincidence.cpp
diff --git a/src/pathops/SkOpCoincidence.cpp b/src/pathops/SkOpCoincidence.cpp
index 0d808db4544bbf95fb8d85a412f614b9abfeb75e..87bb91386975f9d3cb13c9febad906b68c319d02 100755
--- a/src/pathops/SkOpCoincidence.cpp
+++ b/src/pathops/SkOpCoincidence.cpp
@@ -85,6 +85,9 @@ bool SkOpCoincidence::addExpanded(SkChunkAlloc* allocator
         SkOpSpanBase* oStart = oStartPtT->span();
         const SkOpSpanBase* end = coin->fCoinPtTEnd->span();
         const SkOpSpanBase* oEnd = coin->fOppPtTEnd->span();
+        if (oEnd->deleted()) {
+            return false;
+        }
         SkOpSpanBase* test = start->upCast()->next();
         SkOpSpanBase* oTest = coin->fFlipped ? oStart->prev() : oStart->upCast()->next();
         while (test != end || oTest != oEnd) {