RTEMS | bsps/i386/pc386: BSP_poll_char waits for input (#5799)

[Sebastian Huber (@sebhub)]

Issue created by Sebastian Huber: https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5799



`BSP_poll_char` references `BSP_inch()`, which waits until a character arrives.  The function has to return -1 if no character is available.  `getchark()` thus blocks while no input is available.  `ts-validation-io-kernel` stops after its first output until the test runner ends it with a timeout.

Found while running the full test suite on Qemu.  This description was created with Claude Code assistance.

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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5799
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