Remove mis-optimization

Assume thread t1 creates OUString s, then spawns thread t2, then t2 acquires s,
then t2 signals via a channel that does not necessarily involve memory
synchronization (e.g., writes a byte into a pipe which t1 reads), then t1
releases s and can still see a refCount of 1 instead of 2.

Change-Id: I31047a1a6cc8fccc401a87849f5c3cee3642d803

sal/rtl/source/strtmpl.cxx

@@ -1103,8 +1103,7 @@ void SAL_CALL IMPL_RTL_STRINGNAME( release )( IMPL_RTL_STRINGDATA* pThis )
     }
 #endif
 
-    if ( pThis->refCount == 1 ||
-         !osl_atomic_decrement( &(pThis->refCount) ) )
+    if ( !osl_atomic_decrement( &(pThis->refCount) ) )
     {
         RTL_LOG_STRING_DELETE( pThis );
         rtl_freeMemory( pThis );