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ipa_sam was modifying the buffer returned by ipa_gethostfqdn(). Subsequent calls to ipa_gethostfqdn() returned the corrupt data, causing other operations to fail. Update ipa_sam to copy the string and modify the copy. Also document this characteristic of ipa_gethostfqdn() and explain that callers must not modify the returned data. Part of: https://pagure.io/freeipa/issue/8501 Reviewed-By: Fraser Tweedale <ftweedal@redhat.com>