[dpdk-dev] [PATCH v1] app/testpmd: fix return value check

[Rami Rosen]

Fix unchecked return value issue for rte_eth_dev_configure.

Coverity issue: 195021
Fixes: 2a977b891f99 ("app/testpmd: fix DCB configuration")
Cc: stable at dpdk.org

Signed-off-by: Chenbo Xia <chenbo.xia at intel.com>
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Acked-by: <ramirose at gmail.com>