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Due to different stack contents in sdl_display_init on Ubuntu vs other distros, an uninitialized structure is causing a crash. Zeroing the structure makes the behavior uniform across distros, avoiding the Ubuntu crash, but doesn't fix the underlying bugs, notably: the return value of SDL_GetWMInfo needs to be checked, as it's currently failing silently the underlying reason for the failure of SDL_GetWMInfo needs to be found - there is a GetWMINfo method in the internal SDL structure which is NULL, and the reason for this needs to be found. Signed-off-by: Jeff Dike <jdike@linux.intel.com>