misc-modules: clean up hello.
misc-progs: Clean up setlevel.
misc-progs: clean up setconsole.
scull: clean up header.
scull: clean up main.
scull: clean up scull_load.
scull: clean up scull_unload.
scull: clean up scull.init.
misc-modules: clean up faulty.

In particular, convert to the alloc_chrdev_region registration API
used for scull, for consistency.
misc-progs: clean up gdbline.