Use C++11 std::vector<T>::data()

...all uses of bytes::data() look like they're fine with std::vector<T>::data()
not necessarily returning nullptr when empty

Change-Id: I48c3877cfb9fb1a4a129bd1e072410a8bebc87b1

sw/source/filter/ww8/types.hxx

@@ -24,11 +24,7 @@
 
 namespace ww
 {
-    class bytes : public std::vector<sal_uInt8>
-    {
-        public:
-            const sal_uInt8* data() const { return empty() ? 0 : &front(); }
-    };
+    typedef std::vector<sal_uInt8> bytes;
 
     enum WordVersion {eWW1 = 1, eWW2 = 2, eWW6 = 6, eWW7 = 7, eWW8 = 8};
     inline bool IsSevenMinus(WordVersion eVer) { return eVer <= eWW7; }