af_xdp: ensure at least one queue is created
af_xdp: ensure at least one queue is created

Attempting to create an af_xdp interface with zerocopy where the
underlying driver didn't support it would lead to a crash due to
queue creation silently failing.

Type: fix

Signed-off-by: Joshua Roys <920adcc69e095cb1b890c7007f021eb8df538a16@gmail.com>
Change-Id: Ifd9070b8c2b3023d71120c5cf20f7e89d04e4cb3

chrisy/vpp,chrisy/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp,FDio/vpp,FDio/vpp,FDio/vpp,FDio/vpp,FDio/vpp