Staging: hv: mouse_vsc: fix comment coding style

Also mark this as a nice FIXME as we shouldn't ever
care about the value of an atomic variable, which makes me seriously
doubt the validity of this reference counting code.  Odds are it can be
ripped out completly, or at the very least, converted to using a kref.

Cc: Hank Janssen <hjanssen@microsoft.com>
Cc: K. Y. Srinivasan <kys@microsoft.com>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>