Yu Watanabe
d8d6b2275f
Previously, sethostname_idempotent_full() calls gethostname_full() with GET_HOSTNAME_ALLOW_NONE and GET_HOSTNAME_ALLOW_LOCALHOST flags. That intended to get any values set by kernel. But, that does not work, as the hostname may be empty. Let's simplify the logic. The function sethostname_idempotent_full() intends to set the requested hostname only when the current hostname is different from the requested one. So, no check in getostname_full() is required. Hence, simply use the result of uname() here. Fixes #21896.
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