Add return value check for i40e_vsi_delete_mac call in
rte_pmd_i40e_remove_vf_mac_addr as per coverity issue.
Coverity issue: 277224
Fixes: e0cb96204b71 ("net/i40e: add support for representor ports")
Cc: stable@dpdk.org
Signed-off-by: Herakliusz Lipiec <herakliusz.lipiec@intel.com>
Acked-by: Beilei Xing <beilei.xing@intel.com>