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Weston segfaults on startup if wl_display_create fails

Submitted by hob..@..ex.com

Assigned to Wayland bug list

Link to original bug (#106122)

Description

The call to wl_display_create does not check if the returned result is NULL, which can happen (eg if epoll is not compiled into the kernel). This can cause a segfault on startup.

See https://github.com/wayland-project/weston/blob/42c0e14808bfd39e1a2eea34f43f0b5fe20fbb16/compositor/main.c#L1886, and https://github.com/wayland-project/wayland/blob/bf7cc6805396af8df3b40e10c63de701346c93dd/src/wayland-server.c#L1017 for an example of where wl_display_create may return NULL.

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