net/dpaa: fix potential memory leak

net/dpaa: fix potential memory leak

There are several func calls to rte_zmalloc() which don't do null
pointer check on the return value. And before return, the memory is not
freed. Fix it by adding null pointer check and rte_free().

Fixes: 37f9b54bd3cf ("net/dpaa: support Tx and Rx queue setup")
Fixes: 62f53995caaf ("net/dpaa: add frame count based tail drop with CGR")
Cc: stable@dpdk.org
Signed-off-by: Yong Wang <wang.yong19@zte.com.cn>
Reviewed-by: Shreyansh Jain <shreyansh.jain@nxp.com>