Set of 26 potential bugs

[Maxime Villard <max%M00nBSD.net@localhost>]

Hi,
I've improved my code scanner, and it has found 26 potential bugs under sys/.
Instead of flooding tech-kern@/tech-net@/etc with questions and fixes, I put
here a comprehensive list:

        http://m00nbsd.net/ae123a9bae03f7dde5c6d654412daf5a.html#Report-2

Some of them will probably need to be pulled up, like the leak in netinet6
(#03-0x02) which seems to be triggerable from root.

Maxime