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util: set errno when hitting WL_MAP_MAX_OBJECTS

Simon Ser requested to merge emersion/wayland:max-objects-errno into main

Callers may check errno when wl_map_insert_* functions return an error (since 1). Make sure it's always set to a meaningful value when returning an error, otherwise callers might end up checking an errno coming from a completely different function.

Signed-off-by: Simon Ser contact@emersion.fr Fixes: b19488c7 ("util: Limit size of wl_map")

cc @derekf @amezin

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