kill bogus BUG_ON() in do_close_on_exec()

It can be legitimately triggered via procfs access.  Now, at least
2 of 3 of get_files_struct() callers in procfs are useless, but
when and if we get rid of those we can always add WARN_ON() here.
BUG_ON() at that spot is simply wrong.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>