net/pcap: remove local variable shadowing outer one
net/pcap: remove local variable shadowing outer one

'ret' is already defined in the function scope, removing the 'ret' in
the block scope.

Fixes: c9507cd0cada ("net/pcap: support physical interface MAC address")
Cc: stable@dpdk.org

Signed-off-by: Ferruh Yigit <ba8734c3c506d2e3557bd4ac8fdaccd25bdb9aa7@intel.com>
Reviewed-by: David Marchand <f28529695cfa9e3e1eb84e7072aa626af4abb18e@redhat.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk