wayland-shm: Use MAX_BUFFERS macro instead of magic 4

Reviewers: zmike, devilhorns

Reviewed By: devilhorns

Subscribers: cedric

Differential Revision: https://phab.enlightenment.org/D2888

src/modules/evas/engines/wayland_shm/evas_outbuf.c

@@ -37,7 +37,7 @@ _evas_outbuf_setup(int w, int h, int rot, Outbuf_Depth depth, Eina_Bool alpha, s
 
         n = atoi(num);
         if (n <= 0) n = 1;
-        if (n > 4) n = 4;
+        if (n > MAX_BUFFERS) n = MAX_BUFFERS;
 
         ob->num_buff = n;
      }