The ReleaseSession method's Id field is declared as nullable (?string) in
the IDL, allowing callers to omit it so that the method releases the
caller's own session via session_is_self(NULL). The SD_JSON_MANDATORY flag
in the dispatch table contradicts this and makes omitting Id return -EINVAL
("Invalid argument", parameter "Id") instead.
Drop the flag so omitting Id is treated as passing NULL.
Fixes: 2baca6c22b
System and Service Manager
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