assert macro to check null

[Saket Sinha]

I have developed a driver which has become unstable. Now when I debug,I
find that it is crashing at
http://lxr.free-electrons.com/source/kernel/cred.c?v=3.8#L431
get_cred(new); where null is struct cred *new.

I think this new might be NULL.

Now I plan to add an assert in our macro that deals with creds, like for
asserting passed object isn't NULL.

Any suggestions as to how I can do that?

Regards,
Saket Sinha
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