[12079] Remove some redundant explicit NULL checks for pointers before delete or delete[] calls since this check is done implicitly when deleting

Signed-off-by: stfx <stfx@hotmail.de>

src/shared/Threading.cpp

@@ -215,8 +215,7 @@ Thread* Thread::current()
         _thread->m_hThreadHandle = Thread::currentHandle();
 
         Thread* _oldValue = m_ThreadStorage.ts_object(_thread);
-        if (_oldValue)
-            delete _oldValue;
+        delete _oldValue;
     }
 
     return _thread;