drm/drm_bufs.c: Reduce differences with Linux

Make sure functions have the same prototypes and top of body comments as their
corresponding versions in Linux 3.9
drm: Move drm_open() and drm_firstopen() to drm_fops.c

* That's where they are located on Linux

* Also rename drm_firstopen() to drm_setup() to further reduce
  differences
drm: Implement mutex_is_locked()
drm: Implement and use drm_send_vblank_event()
fetch.1: Use .Mt for email address.
Add missing newlines at EOF in a couple of files.