pam_systemd: Properly check kdbus availability
This properly avoids setting DBUS_SESSION_BUS_ADDRESS if kdbus is loaded (or built into the kernel) but not wanted.
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@ -181,7 +181,7 @@ static int export_legacy_dbus_address(
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int r;
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/* skip export if kdbus is not active */
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if (access("/sys/fs/kdbus", F_OK) < 0)
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if (!is_kdbus_available())
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return PAM_SUCCESS;
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if (asprintf(&s, KERNEL_USER_BUS_ADDRESS_FMT ";" UNIX_USER_BUS_ADDRESS_FMT, uid, runtime) < 0) {
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