RTEMS | Only restore terminal settings on exit when captured (!300)

[yang zhang (@yang.zhang)]

yang zhang commented on a discussion on cpukit/libmisc/shell/shell.c: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/300#note_114833

 >        return false;
 >      }
 >      /* Make a raw terminal, Linux Manuals */
 > -    if (tcgetattr(fileno(stdin), &previous_term) >= 0) {
 > +    have_previous_term = tcgetattr(fileno(stdin), &previous_term);
 > +    if (have_previous_term == 0) {

Thank you for your suggestions，i have made further revisions, please review.
Thanks.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/300#note_114833
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