Speculative fix for win8 bot crash in ~GrAutoLocaleSetter

src/gpu/GrAutoLocaleSetter.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrAutoLocaleSetter_DEFINED
 #define GrAutoLocaleSetter_DEFINED
 
@@ skipping 24 matching lines @@
         } else {
             fOldLocale = static_cast<locale_t>(0);
         }
 #else
         (void) name; // suppress unused param warning.
 #endif
     }
 
     ~GrAutoLocaleSetter () {
 #if defined(SK_BUILD_FOR_WIN)
-        setlocale(LC_ALL, fOldLocale);
+        if (fOldLocale) {
+            setlocale(LC_ALL, fOldLocale);
+        }
         _configthreadlocale(fOldPerThreadLocale);
 #elif !defined(SK_BUILD_FOR_ANDROID) && !defined(__UCLIBC__)
         if (fLocale) {
              uselocale(fOldLocale);
              freelocale(fLocale);
         }
 #endif
     }
 
 private:
 #if defined(SK_BUILD_FOR_WIN)
     int fOldPerThreadLocale;
     const char* fOldLocale;
 #elif !defined(SK_BUILD_FOR_ANDROID) && !defined(__UCLIBC__)
     locale_t fOldLocale;
     locale_t fLocale;
 #endif
 };
 
 #endif