RTEMS | Fix_Issue_1828: Respect forever flag on failed login (!1355)

[Mohamed Ayman (@mohamedayman23)]

Mohamed Ayman created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1355

Project:Branches: mohamedayman23/rtems:Parameter-forever-is-ignored-with-login-function-Issue to rtems/rtos/rtems:main
Author:   Mohamed Ayman



## Fix_Issue_1828: Respect forever flag on failed login

The shell main loop used a single result variable both to record whether the previous login/command attempt succeeded and to decide whether the loop should continue.

When the login function failed after repeated incorrect passwords, result became false, and the loop condition then exited the shell regardless of the forever flag being set.

Track login failures separately with a new login_failed flag, and use it alongside result in the loop condition so that a failed login correctly falls through to a new login attempt when forever is set, matching the documented behavior of that flag. Other exit paths EOF, explicit logout and exit are unaffected.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1355
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