drivers/tty/tty_jobctrl.c - fix non-kerneldoc comment

Building with W=1 reports (among other things):
  CC      drivers/tty/tty_jobctrl.o
drivers/tty/tty_jobctrl.c:317: warning: Cannot understand  *
 on line 317 - I thought it was a doc line

Fix up the non-kerneldoc comment. (other warnings to be cleaned up in separate patch)

Signed-off-by Valdis Kletnieks <valdis.kletnieks@vt.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/tty_jobctrl.c

@@ -313,7 +313,7 @@ void disassociate_ctty(int on_exit)
 	read_unlock(&tasklist_lock);
 }
 
-/**
+/*
  *
  *	no_tty	- Ensure the current process does not have a controlling tty
  */