Fix memory leak in FuzzGradients

fuzz/Fuzz.h

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef Fuzz_DEFINED
 #define Fuzz_DEFINED
 
 #include "SkData.h"
 #include "SkTRegistry.h"
 #include "SkTypes.h"
 
 class Fuzz : SkNoncopyable {
 public:
     explicit Fuzz(sk_sp<SkData>);
 
     // Returns the total number of "random" bytes available.
     size_t size();
     // Returns the total number of "random" bytes remaining for randomness.
     size_t remaining();
 
     template <typename T>
-    bool next(T* n);
+    bool SK_WARN_UNUSED_RESULT next(T* n);
 
     // UBSAN reminds us that bool can only legally hold 0 or 1.
-    bool next(bool* b) {
+    bool SK_WARN_UNUSED_RESULT next(bool* b) {
         uint8_t byte;
         if (!this->next(&byte)) {
             return false;
         }
         *b = (byte & 1) == 1;
         return true;
     }
 
     // The nextFoo methods are deprecated.
     // TODO(kjlubick): replace existing uses with next() and remove these.
@@ skipping 39 matching lines @@
     const char* name;
     void (*fn)(Fuzz*);
 };
 
 #define DEF_FUZZ(name, f)                                        \
     static void fuzz_##name(Fuzz*);                              \
     SkTRegistry<Fuzzable> register_##name({#name, fuzz_##name}); \
     static void fuzz_##name(Fuzz* f)
 
 #endif//Fuzz_DEFINED