mem: check allocation in dynamic hugepage init
mem: check allocation in dynamic hugepage init

The function malloc() could return NULL, the return value
need to be checked.

Fixes: 6f63858e55e6 ("mem: prevent preallocated pages from being freed")
Cc: stable@dpdk.org

Signed-off-by: Yunjian Wang <9985a735d5d5f80ef648228b285228d6eb6eaf45@huawei.com>
Reviewed-by: David Marchand <f28529695cfa9e3e1eb84e7072aa626af4abb18e@redhat.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk