coverity#707713 Uninitialized pointer field

Change-Id: I4c51287f20d070fe3227adb5a1909c9539938f27

cppu/source/threadpool/current.cxx

@@ -111,6 +111,7 @@ public:
 
 inline ThreadKey::ThreadKey( oslThreadKeyCallbackFunction pCallback ) SAL_THROW(())
     : _bInit( false )
+    , _hThreadKey( 0 )
     , _pCallback( pCallback )
 {
 }