Fix --keep-foreign when the target is missing completely #109
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isLink returns non-zero value when a file is a symlink. However, the old code also returned -1 when lsat failed. (cherry picked from commit c55ba54)
Normally alternatives will only refuse to create a link to /etc/alternatives/* if the file already exists and is not a symlink. But alternatives never checked if existing symlink goes to /etc/alternatives/. This is a weird behavior, but we did not want to change the default behavior so we added --keep-foreign option that is more strict and checks that the target if the symlink is in /etc/alternatives/. But we missed the corner-case where there is no file at all and incorrectly reported on error. Fixes fedora-sysv#102 (cherry picked from commit bd9b6cc)
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Resolves: #2203820