Fix warnings from go vet

Signed-off-by: Alexandr Morozov <lk4d4math@gmail.com>

console/console.go

@@ -114,7 +114,7 @@ func OpenPtmx() (*os.File, error) {
 func OpenTerminal(name string, flag int) (*os.File, error) {
 	r, e := syscall.Open(name, flag, 0)
 	if e != nil {
-		return nil, &os.PathError{"open", name, e}
+		return nil, &os.PathError{Op: "open", Path: name, Err: e}
 	}
 	return os.NewFile(uintptr(r), name), nil
 }

mount/init.go

@@ -236,7 +236,7 @@ func reOpenDevNull(rootfs string) error {
 		if stat.Rdev == devNullStat.Rdev {
 			// Close and re-open the fd.
 			if err = syscall.Dup2(int(file.Fd()), fd); err != nil {
-				return fmt.Errorf("Failed to dup fd %d to fd %d - %s", file.Fd(), fd)
+				return fmt.Errorf("Failed to dup fd %d to fd %d - %s", file.Fd(), fd, err)
 			}
 		}
 	}

netlink/netlink_linux_test.go

@@ -27,7 +27,7 @@ func TestAddDelNetworkIp(t *testing.T) {
 	ifaceName := "lo"
 	ip := net.ParseIP("127.0.1.1")
 	mask := net.IPv4Mask(255, 255, 255, 255)
-	ipNet := &net.IPNet{ip, mask}
+	ipNet := &net.IPNet{IP: ip, Mask: mask}
 
 	iface, err := net.InterfaceByName(ifaceName)
 	if err != nil {
@@ -47,7 +47,7 @@ func TestAddDelNetworkIp(t *testing.T) {
 	}
 
 	if ipAssigned(iface, ip) {
-		t.Fatal("Located address '%s' in lo address list after removal.", ip.String())
+		t.Fatalf("Located address '%s' in lo address list after removal.", ip.String())
 	}
 }