backend-wayland: do not try to release uninitialized seat
Do not call weston_seat_release() if Weston aborts before weston_seat_init() could be called. This fixes a possible segfault due to uninitialized list traversal in the error path.
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Do not call weston_seat_release() if Weston aborts before weston_seat_init() could be called. This fixes a possible segfault due to uninitialized list traversal in the error path.