fsnotify: inotify -- Don't forget to init fields of fsnotify_mark_info

The object is allocated with malloc. The lack of initialization
is not problem at moment since we assign members in
collect_inotify_mark unconditionally but it might cause problems
in future so better to init it as early as possible.

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>