fix fuzzers

src/pathops/SkPathWriter.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #include "SkOpSpan.h"
 #include "SkPathOpsPoint.h"
 #include "SkPathWriter.h"
 #include "SkTSort.h"
@@ skipping 30 matching lines @@
 
 void SkPathWriter::cubicTo(const SkPoint& pt1, const SkPoint& pt2, const SkOpPtT* pt3) {
     this->update(pt3);
 #if DEBUG_PATH_CONSTRUCTION
     SkDebugf("path.cubicTo(%1.9g,%1.9g, %1.9g,%1.9g, %1.9g,%1.9g);\n",
             pt1.fX, pt1.fY, pt2.fX, pt2.fY, pt3->fPt.fX, pt3->fPt.fY);
 #endif
     fCurrent.cubicTo(pt1, pt2, pt3->fPt);
 }
 
-void SkPathWriter::deferredLine(const SkOpPtT* pt) {
+bool SkPathWriter::deferredLine(const SkOpPtT* pt) {
     SkASSERT(fFirstPtT);
     SkASSERT(fDefer[0]);
     if (fDefer[0] == pt) {
         // FIXME: why we're adding a degenerate line? Caller should have preflighted this.
-        return;
+        return true;
     }
     if (pt->contains(fDefer[0])) {
         // FIXME: why we're adding a degenerate line?
-        return;
+        return true;
     }
-    SkASSERT(!this->matchedLast(pt));
+    if (this->matchedLast(pt)) {
+        return false;
+    }
     if (fDefer[1] && this->changedSlopes(pt)) {
         this->lineTo();
         fDefer[0] = fDefer[1];
     }
     fDefer[1] = pt;
+    return true;
 }
 
 void SkPathWriter::deferredMove(const SkOpPtT* pt) {
     if (!fDefer[1]) {
         fFirstPtT = fDefer[0] = pt;
         return;
     }
     SkASSERT(fDefer[0]);
     if (!this->matchedLast(pt)) {
         this->finishContour();
@@ skipping 275 matching lines @@
         }
     } while (rIndex < linkCount);
 #if DEBUG_ASSEMBLE
     for (rIndex = 0; rIndex < linkCount; ++rIndex) {
        SkASSERT(sLink[rIndex] == SK_MaxS32);
        SkASSERT(eLink[rIndex] == SK_MaxS32);
     }
 #endif
     return;
 }