ecore_wl2: Add buffer age inc and use it in surface code

Technically not necessary, since we could do this with get and set, but
it's a little more convenient to the user this way.

src/lib/ecore_wl2/Ecore_Wl2.h

@@ -2011,6 +2011,7 @@ EAPI Eina_Bool ecore_wl2_buffer_busy_get(Ecore_Wl2_Buffer *buffer);
 EAPI void ecore_wl2_buffer_busy_set(Ecore_Wl2_Buffer *buffer);
 EAPI int ecore_wl2_buffer_age_get(Ecore_Wl2_Buffer *buffer);
 EAPI void ecore_wl2_buffer_age_set(Ecore_Wl2_Buffer *buffer, int age);
+EAPI void ecore_wl2_buffer_age_inc(Ecore_Wl2_Buffer *buffer);
 
 EAPI Ecore_Wl2_Surface *ecore_wl2_surface_create(Ecore_Wl2_Window *win, Eina_Bool alpha);
 EAPI void ecore_wl2_surface_destroy(Ecore_Wl2_Surface *surface);

src/lib/ecore_wl2/ecore_wl2_buffer.c

@@ -703,6 +703,14 @@ EAPI void ecore_wl2_buffer_age_set(Ecore_Wl2_Buffer *buffer, int age)
    buffer->age = age;
 }
 
+EAPI void
+ecore_wl2_buffer_age_inc(Ecore_Wl2_Buffer *buffer)
+{
+   EINA_SAFETY_ON_NULL_RETURN(buffer);
+
+   buffer->age++;
+}
+
 static Ecore_Wl2_Buffer *
 _ecore_wl2_buffer_partial_create(int w, int h, Eina_Bool alpha)
 {

src/lib/ecore_wl2/ecore_wl2_surface.c

@@ -132,7 +132,7 @@ _evas_dmabuf_surface_assign(Ecore_Wl2_Surface *s)
         return 0;
      }
    EINA_LIST_FOREACH(s->buffers, l, b)
-     b->age++;
+     ecore_wl2_buffer_age_inc(b);
 
    return ecore_wl2_buffer_age_get(s->current);
 }