devpts: add fsnotify create event

Currently, devpts doesn't generate an fsnotify event upon pts creation
because the regular vfs paths aren't involved.  Deallocation, on the other
hand, correctly generates a nameremove event thanks to the d_delete()
invocation in devpts_pty_kill().

This patch adds the missing fsnotify_create() trigger in devpts_pty_new().

Signed-off-by: Florin Malita <fmalita@gmail.com>
Acked-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>