Check toytoolkit shm space reservation.
Submitted by Pekka Paalanen
Assigned to Pekka Paalanen
In window.c, display_create_shm_surface() uses data_length_for_shm_surface() to compute the pool size. However, that hardcodes RGBA32 pixel format, even if we were going to use RGB565.
Review the code, and fix the overallocation if it indeed happens.