ecore_evas_wayland: prevent duplicated shutdown of ecore_wl

Summary:
When the ecore_evas of wayland_egl/shm is freed with ecore_evas_free(),
ecore_wl_shutdown() is called by _ecore_evas_wl_common_free().
so ecore_wl_shutdown() after ecore_evas_free() has to be skipped.
@fix

Reviewers: devilhorns, raster, zmike, gwanglim

Subscribers: cedric

Differential Revision: https://phab.enlightenment.org/D2503

src/modules/ecore_evas/engines/wayland/ecore_evas_wayland_egl.c

@@ -275,6 +275,7 @@ ecore_evas_wayland_egl_new_internal(const char *disp_name, unsigned int parent,
 
  err:
    ecore_evas_free(ee);
+   return NULL;
 
  ee_err:
    ecore_wl_shutdown();

src/modules/ecore_evas/engines/wayland/ecore_evas_wayland_shm.c

@@ -269,6 +269,8 @@ ecore_evas_wayland_shm_new_internal(const char *disp_name, unsigned int parent,
 
  err:
    ecore_evas_free(ee);
+   return NULL;
+
  ee_err:
    ecore_wl_shutdown();
    return NULL;