fix fuzzers

src/pathops/SkPathOpsCommon.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 "SkAddIntersections.h"
 #include "SkOpCoincidence.h"
 #include "SkOpEdgeBuilder.h"
 #include "SkPathOpsCommon.h"
@@ skipping 300 matching lines @@
     } else {
         (void) coincidence->expand(DEBUG_COIN_ONLY_PARAMS());
     }
     (void) coincidence->expand(DEBUG_COIN_ONLY_PARAMS());
 
     SkOpCoincidence overlaps(globalState);
     safetyHatch = SAFETY_COUNT;
     do {
         SkOpCoincidence* pairs = overlaps.isEmpty() ? coincidence : &overlaps;
         // adjust the winding value to account for coincident edges
-        pairs->apply(DEBUG_ITER_ONLY_PARAMS(SAFETY_COUNT - safetyHatch));  
+        if (!pairs->apply(DEBUG_ITER_ONLY_PARAMS(SAFETY_COUNT - safetyHatch))) {
+            return false;
+        } 
         // For each coincident pair that overlaps another, when the receivers (the 1st of the pair)
         // are different, construct a new pair to resolve their mutual span
         if (!pairs->findOverlaps(&overlaps  DEBUG_ITER_PARAMS(SAFETY_COUNT - safetyHatch))) {
             return false;
         }
         if (!--safetyHatch) {
             SkASSERT(globalState->debugSkipAssert());
             return false;
         }
     } while (!overlaps.isEmpty());
     calc_angles(contourList  DEBUG_COIN_PARAMS());
     if (!sort_angles(contourList)) {
         return false;
     }
 #if DEBUG_COINCIDENCE_VERBOSE
     coincidence->debugShowCoincidence();
 #endif
 #if DEBUG_COINCIDENCE
     coincidence->debugValidate();
 #endif
     SkPathOpsDebug::ShowActiveSpans(contourList);
     return true;
 }