Dead code

...introduced with aeb3853a21 "osl: (Win32) check
allocated pipe succeeded, otherwise needs to fail"

Change-Id: Ieeb0b1755e74f583d1b52447eb84f7512eb07914

sal/osl/w32/pipe.cxx

@@ -153,8 +153,6 @@ oslPipe SAL_CALL osl_createPipe(rtl_uString *strPipeName, oslPipeOptions Options
     pPipe = osl_createPipeImpl();
 
     assert(pPipe);  // if osl_createPipeImpl() cannot init. a new pipe, this is a failure
-    if (!pPipe)
-        return nullptr;
 
     osl_atomic_increment(&(pPipe->m_Reference));