RTEMS | libmisc/shell: Only restore terminal settings on exit when captured (!300)

[yang zhang (@yang.zhang)]

yang zhang commented: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/300#note_114724


I'm trying porting ssh.
Currently ssh work on no-pty mode, shell's stdin/stdout/stderr is redirected on socket pair, it does not support tcgetattr and tcsetattr.

When exiting ssh session shell, if tcgetattr failed, i think it is not neccessary to call tcsetattr again to avoid some unnecessary logs.
"PTY allocation request failed on channel 0

logs:
RTEMS Shell on no console. Use 'help' to list commands.
exit
hell: cannot reset terminal attributes (no console)"

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/300#note_114724
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