Wayland_EGL: Add return value to eng_setup

Wayland_EGL: Add return value to eng_setup

Removing this block can lead to undefined behavior. It was removed by the
following commit:

commit 5cf962b39e77662dd6148a6a3468acbb51c78878
Author: Manuel Bachmann <manuel.bachmann@eurogiciel.fr>
Date:   Thu Dec 5 17:50:58 2013 +0100

    Fix window hide/show() using withdrawn_set()

    Bug-Tizen: https://bugs.tizen.org/jira/browse/TIVI-2048
    Bug-Upstream: https://phab.enlightenment.org/T155

    Co-Authored-by: Rafael Antognolli <rafael.antognolli@intel.com>
    Signed-off-by: Manuel Bachmann <manuel.bachmann@open.eurogiciel.org>
Change-Id: I25844c7e31db55f1100d663633aa9374bda306b0
Signed-off-by: Eduardo Lima (Etrunko) <eduardo.lima@intel.com>