[PATCH V2] testing/selftests/mqueue: Fix mq_perf_tests to free the allocated cpu set

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The selftest "mqueue/mq_perf_tests.c" use CPU_ALLOC to allocate
CPU set. This cpu set is used further in pthread_attr_setaffinity_np
and by pthread_create in the code. But in current code, allocated
cpu set is not freed.

Fix this issue by adding CPU_FREE in the "shutdown" function which
is called in most of the error/exit path for the cleanup. Also add
CPU_FREE in some of the error paths where shutdown is not called.

Fixes: 7820b0715b6f ("tools/selftests: add mq_perf_tests")
Signed-off-by: Athira Rajeev <atrajeev@xxxxxxxxxxxxxxxxxx>
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