[patch] fix modprobe segfault without args

[Timo Teräs]

Denys Vlasenko wrote:
> On Wednesday 29 October 2008 15:45, Timo Teräs wrote:
>> The new modprobe stuff does not handle properly the case if no arguments at all
>> is passed. The patch below fixes it.
> 
> Applied with some additional code shrink. Can you test
> that svn has it fixed? Thanks for fix!

Looks ok to me. Passed my trivial test cases too.

- Timo