RTEMS | libdl: Fix NULL pointer deref in rap app alloc (!1363)

[Joel Sherrill (@joel)]

Joel Sherrill started a new 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.

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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1363#note_155231
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