eal: fix crash when allocating memory on a control thread

eal: fix crash when allocating memory on a control thread

By using rte_malloc(), the choice of a numa socket
in case of SOCKET_ID_ANY is 0. This may lead to control
thread crash in alloc_seg() when numa node 0 is not used.

Let's choose the first numa socket where memory is available.

Note:
malloc_get_numa_socket is no longer small(contains a loop).
Hence, inline keyword was removed.

PR=74909
Fixes: b94580d6887e ("malloc: avoid unknown socket id")
Signed-off-by: Ilyes Ben Hamouda <ilyes.ben_hamouda@6wind.com>
Acked-by: Olivier Matz <olivier.matz@6wind.com>