RTEMS | Follow-up from "libdl: Fix NULL pointer deref in rap app alloc" (#5658)

[Vijay Banerjee (@vijay)]

Issue created by Vijay Banerjee: https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5658



The following discussion from !1363 should be addressed:

- [ ] @joel started a [discussion](https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1363#note_155231): 

    > It should be possible to trigger the out of memory error. Some tests like testsuites/sptests/spfatal09/init.c have a _consume_all_memory()_ function. Others use someting like spmountmgr01/init.c: which uses _rtems_heap_greedy_allocate()_. Since this is an allocation via _malloc()_, the second method should work. 
    > 
    > There are tests under libtests/dl* which use RAP. Copying one of them and allocating all of the memory before calling the service that uses _rtems_rap_app_alloc()_ may be enough to trigger this. And yes, I am suggesting adding a new test executable to exercise this.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5658
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