[Inotify] Remove dead/duplicate code

Summary:
event->mask & EventQueueOverflow is already checked once early in the
function, no need to do the check twice.

Reviewers: Baloo, ngraham

Reviewed By: Baloo, ngraham

Subscribers: pino, kde-frameworks-devel

Tags: Frameworks, Baloo

Differential Revision: https://phabricator.kde.org/D28324