As the possible failure of the malloc(), the not_checked and
checked could be NULL pointer.
Therefore, it should be better to check it in order to avoid
the dereference of the NULL pointer.
Fixes: fa8054c8c889 ("examples/eventdev: add thread safe Tx worker pipeline")
Cc: stable@dpdk.org
Signed-off-by: Shiqi Liu <835703180@qq.com>
d914c01036