basic/virt: fix userns check on CONFIG_USER_NS=n kernel (#4651)
ENOENT should be treated as "false", but because of the broken errno check it was treated as an error. So ConditionVirtualization=user-namespaces probably returned the correct answer, but only by accident. Fixes #4608.
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@ -496,7 +496,7 @@ static int userns_has_mapping(const char *name) {
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f = fopen(name, "re");
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if (!f) {
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log_debug_errno(errno, "Failed to open %s: %m", name);
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return errno == -ENOENT ? false : -errno;
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return errno == ENOENT ? false : -errno;
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}
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n = getline(&buf, &n_allocated, f);
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