Macro explanation

[Manish Katiyar]

>> I did not understand the first line of both macro. Will it not create
>> the NULL pointer dereference problem? I know it works and read some
>> article but it did not explain this part, so can anyone explain why
>> the NULL pointer error is not coming. Am I missing something?
>> Any C language specification of such example.

There is also some interesting reply (See the reply to thread from
Laurent) at http://www.spinics.net/lists/linux-usb-devel/msg11766.html

-- 
Thanks -
Manish