fix fuzz bugs

src/pathops/SkPathOpsTypes.h

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #ifndef SkPathOpsTypes_DEFINED
 #define SkPathOpsTypes_DEFINED
 
 #include <float.h>  // for FLT_EPSILON
@@ skipping 166 matching lines @@
     SkPath::Verb fDebugWorstVerb[6];
     SkPoint fDebugWorstPts[24];
     float fDebugWorstWeight[6];
 #endif
 #if DEBUG_COINCIDENCE
     bool fDebugCheckHealth;
 #endif
 };
 
 #ifdef SK_DEBUG
-#define SkOPASSERT(cond) SkASSERT(this->globalState()->debugSkipAssert() || cond)
+#define SkOPASSERT(cond) SkASSERT((this->globalState() && \
+        this->globalState()->debugSkipAssert()) || cond)
 #define SkOPOBJASSERT(obj, cond) SkASSERT((obj->debugGlobalState() && \
         obj->debugGlobalState()->debugSkipAssert()) || cond)
 #else
 #define SkOPASSERT(cond)
 #define SkOPOBJASSERT(obj, cond)
 #endif
 
 // Use Almost Equal when comparing coordinates. Use epsilon to compare T values.
 bool AlmostEqualUlps(float a, float b);
 inline bool AlmostEqualUlps(double a, double b) {
@@ skipping 379 matching lines @@
 */
 inline int SkDSideBit(double x) {
     return 1 << SKDSide(x);
 }
 
 inline double SkPinT(double t) {
     return precisely_less_than_zero(t) ? 0 : precisely_greater_than_one(t) ? 1 : t;
 }
 
 #endif