[AUDIT] - State.c is clean, it is merely a collection of trivial ~10 line wrappers...

[AUDIT] - State.c is clean, it is merely a collection of trivial ~10 line wrappers around the actual kernel (Ke) functions which do the work.
- Rename suspend.c to state.c (since it also had resume APIs) and add alert APIs from kthread to it too.
- Fix a bug in one of the alert APIs which was probing for a valid pointer even if the caller had given NULL (which is valid if the caller doesn't want the previous state returned).

svn path=/trunk/; revision=23146