fix fuzz busters

src/pathops/SkOpCoincidence.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #include "SkOpCoincidence.h"
 #include "SkOpSegment.h"
 #include "SkPathOpsTSect.h"
 
@@ skipping 752 matching lines @@
         }
         const SkOpSegment* outerOpp = oos->segment();
         SkASSERT(!outerOpp->done());
         SkOpSegment* outerCoinWritable = const_cast<SkOpSegment*>(outerCoin);
         SkOpSegment* outerOppWritable = const_cast<SkOpSegment*>(outerOpp);
         SkCoincidentSpans* inner = outer;
         while ((inner = inner->next())) {
             this->debugValidate();
             double overS, overE;
             const SkOpPtT* ics = inner->coinPtTStart();
-            SkASSERT(!ics->deleted());
+            FAIL_IF(ics->deleted());
             const SkOpSegment* innerCoin = ics->segment();
             SkASSERT(!innerCoin->done());
             const SkOpPtT* ios = inner->oppPtTStart();
             SkASSERT(!ios->deleted());
             const SkOpSegment* innerOpp = ios->segment();
             SkASSERT(!innerOpp->done());
             SkOpSegment* innerCoinWritable = const_cast<SkOpSegment*>(innerCoin);
             SkOpSegment* innerOppWritable = const_cast<SkOpSegment*>(innerOpp);
             if (outerCoin == innerCoin) {
                 const SkOpPtT* oce = outer->coinPtTEnd();
@@ skipping 55 matching lines @@
 
 bool SkOpCoincidence::addOverlap(const SkOpSegment* seg1, const SkOpSegment* seg1o,
         const SkOpSegment* seg2, const SkOpSegment* seg2o,
         const SkOpPtT* overS, const SkOpPtT* overE) {
     const SkOpPtT* s1 = overS->find(seg1);
     const SkOpPtT* e1 = overE->find(seg1);
     FAIL_IF(!e1);
     if (!s1->starter(e1)->span()->upCast()->windValue()) {
         s1 = overS->find(seg1o);
         e1 = overE->find(seg1o);
+        FAIL_IF(!s1);
         FAIL_IF(!e1);
         if (!s1->starter(e1)->span()->upCast()->windValue()) {
             return true;
         }
     }
     const SkOpPtT* s2 = overS->find(seg2);
     const SkOpPtT* e2 = overE->find(seg2);
     if (!s2->starter(e2)->span()->upCast()->windValue()) {
         s2 = overS->find(seg2o);
         e2 = overE->find(seg2o);
@@ skipping 500 matching lines @@
     }
     do {
         if (coin->coinPtTStart()->segment() == deleted
                 || coin->coinPtTEnd()->segment() == deleted
                 || coin->oppPtTStart()->segment() == deleted
                 || coin->oppPtTEnd()->segment() == deleted) {
             this->release(fHead, coin);
         }
     } while ((coin = coin->next()));
 }