check for null on Lion

http://codereview.appspot.com/5369107/

M    src/ports/SkFontHost_mac_coretext.cpp



git-svn-id: http://skia.googlecode.com/svn/trunk@2674 2bbb7eff-a529-9590-31e7-b0007b416f81

src/ports/SkFontHost_mac_coretext.cpp

@@ -331,7 +331,7 @@ public:
     const uint16_t* getShortPtr() { 
         return fObj ? (const uint16_t*) CFDataGetBytePtr(fObj) : NULL; 
     }
-    ~AutoCFDataRelease() { CFRelease(fObj); }
+    ~AutoCFDataRelease() { CFSafeRelease(fObj); }
 private:
     CFDataRef fObj;
 };