pkg/ip: Ensure that SetupVeth returns correct hostVeth

The veth is moved from the container NS to the host NS.
This is handled by the code that sets the link to UP but the wrong
hostVeth is returned to the calling code.

pkg/ip/link.go

@@ -117,7 +117,7 @@ func SetupVeth(contVethName string, mtu int, hostNS ns.NetNS) (hostVeth, contVet
 	}
 
 	err = hostNS.Do(func(_ ns.NetNS) error {
-		hostVeth, err := netlink.LinkByName(hostVethName)
+		hostVeth, err = netlink.LinkByName(hostVethName)
 		if err != nil {
 			return fmt.Errorf("failed to lookup %q in %q: %v", hostVethName, hostNS.Path(), err)
 		}