error message duplication

[kolyshkin]

When -d is specified for crun run, some errors got duplicated:

# crun --systemd-cgroup run xxx
2020-04-17T06:53:17.000170557Z: sd-bus call: No such device or address

# crun --systemd-cgroup run -d xxx
2020-04-17T06:53:21.000210517Z: sd-bus call: No such device or address
2020-04-17T06:53:21.000210890Z: sd-bus call: No such device or address

From strace:

pid 25814] close(3)                    = 0
[pid 25817] read(3, "TZif2\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\0\0\0\1\0\0\0\0"..., 4096) = 62
[pid 25817] close(3 <unfinished ...>
[pid 25814] write(2, "\33[1;31m2020-04-17T06:55:55.00079"..., 822020-04-17T06:55:55.000792131Z: sd-bus call: No such device or address
 <unfinished ...>
[pid 25817] <... close resumed>)        = 0
[pid 25814] <... write resumed>)        = 82
[pid 25817] write(2, "\33[1;31m2020-04-17T06:55:55.00079"..., 822020-04-17T06:55:55.000792087Z: sd-bus call: No such device or address
) = 82
[pid 25814] exit_group(1 <unfinished ...>
[pid 25817] exit_group(1 <unfinished ...>

[giuseppe]

opened a PR: #338