tcm_fc comments

[Christoph Hellwig <hch@infradead.org>]

 - please remove all the extra -I lines in EXTRA_CLFAGs, none of them
   should be needed.
 - CONFIGFS_TCM_FC_DEBUG should be used directly in the code instead of
   definining another symbol
 - there's no need for thread_wq, you can just do a wake_up_process
   on the task_struct for the thread.  That also means you don't have
   the races with the kthread API you currently have
 - The set_user_nice in ft_thread needs a comment explaning why you
   really need to mess with priorities here.  I suspect you don't have
   to anyway.
 - There's lots of code like "if (!(acl)) {" with completley superflous
   braces.

In general it would have been nice to have sent a review request to
linux-scsi, especially as most of these items have been commented on
multiple times for other target frontends before.