inotify: fix check for one-shot watches before destroying them

As the IN_ONESHOT bit is never set when an event is sent we must check it
in the watch's mask and not in the event's mask.

Signed-off-by: Ulisses Furquim <ulissesf@gmail.com>
Reported-by: "Clem Taylor" <clem.taylor@gmail.com>
Tested-by: "Clem Taylor" <clem.taylor@gmail.com>
Cc: Amy Griffis <amy.griffis@hp.com>
Cc: Robert Love <rlove@google.com>
Cc: John McCutchan <ttb@tentacle.dhs.org>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>