Omitting inputs and outputs mbuf creation for BaseBand Null Device
as inputs and outputs data do not exist for Null Device
Fixes: b2a4654f082b ("mempool: check for zero size creation")
Cc: stable@dpdk.org
Signed-off-by: Kamil Chalupnik <kamilx.chalupnik@intel.com>
Tested-by: Yuan Peng <yuan.peng@intel.com>
Acked-by: Amr Mokhtar <amr.mokhtar@intel.com>
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