Fix some style issues as suggested by golint

Signed-off-by: Alexander Morozov <lk4d4@docker.com>

addr.go

@@ -14,8 +14,8 @@ type Addr struct {
 }
 
 // String returns $ip/$netmask $label
-func (addr Addr) String() string {
-	return fmt.Sprintf("%s %s", addr.IPNet, addr.Label)
+func (a Addr) String() string {
+	return fmt.Sprintf("%s %s", a.IPNet, a.Label)
 }
 
 // ParseAddr parses the string representation of an address in the

addr_linux.go

@@ -81,7 +81,7 @@ func AddrList(link Link, family int) ([]Addr, error) {
 		index = base.Index
 	}
 
-	res := make([]Addr, 0)
+	var res []Addr
 	for _, m := range msgs {
 		msg := nl.DeserializeIfAddrmsg(m)
 

link_linux.go

@@ -579,8 +579,7 @@ func LinkList() ([]Link, error) {
 		return nil, err
 	}
 
-	res := make([]Link, 0)
-
+	var res []Link
 	for _, m := range msgs {
 		link, err := linkDeserialize(m)
 		if err != nil {

neigh_linux.go

@@ -141,7 +141,7 @@ func NeighList(linkIndex, family int) ([]Neigh, error) {
 		return nil, err
 	}
 
-	res := make([]Neigh, 0)
+	var res []Neigh
 	for _, m := range msgs {
 		ndm := deserializeNdmsg(m)
 		if linkIndex != 0 && int(ndm.Index) != linkIndex {

nl/nl_linux.go

@@ -172,16 +172,16 @@ type NetlinkRequest struct {
 }
 
 // Serialize the Netlink Request into a byte array
-func (msg *NetlinkRequest) Serialize() []byte {
+func (req *NetlinkRequest) Serialize() []byte {
 	length := syscall.SizeofNlMsghdr
-	dataBytes := make([][]byte, len(msg.Data))
-	for i, data := range msg.Data {
+	dataBytes := make([][]byte, len(req.Data))
+	for i, data := range req.Data {
 		dataBytes[i] = data.Serialize()
 		length = length + len(dataBytes[i])
 	}
-	msg.Len = uint32(length)
+	req.Len = uint32(length)
 	b := make([]byte, length)
-	hdr := (*(*[syscall.SizeofNlMsghdr]byte)(unsafe.Pointer(msg)))[:]
+	hdr := (*(*[syscall.SizeofNlMsghdr]byte)(unsafe.Pointer(req)))[:]
 	next := syscall.SizeofNlMsghdr
 	copy(b[0:next], hdr)
 	for _, data := range dataBytes {
@@ -193,9 +193,9 @@ func (msg *NetlinkRequest) Serialize() []byte {
 	return b
 }
 
-func (msg *NetlinkRequest) AddData(data NetlinkRequestData) {
+func (req *NetlinkRequest) AddData(data NetlinkRequestData) {
 	if data != nil {
-		msg.Data = append(msg.Data, data)
+		req.Data = append(req.Data, data)
 	}
 }
 
@@ -218,7 +218,7 @@ func (req *NetlinkRequest) Execute(sockType int, resType uint16) ([][]byte, erro
 		return nil, err
 	}
 
-	res := make([][]byte, 0)
+	var res [][]byte
 
 done:
 	for {

nl/xfrm_linux.go

@@ -104,9 +104,8 @@ func (x *XfrmAddress) ToIPNet(prefixlen uint8) *net.IPNet {
 	ip := x.ToIP()
 	if GetIPFamily(ip) == FAMILY_V4 {
 		return &net.IPNet{IP: ip, Mask: net.CIDRMask(int(prefixlen), 32)}
-	} else {
-		return &net.IPNet{IP: ip, Mask: net.CIDRMask(int(prefixlen), 128)}
 	}
+	return &net.IPNet{IP: ip, Mask: net.CIDRMask(int(prefixlen), 128)}
 }
 
 func (x *XfrmAddress) FromIP(ip net.IP) {
@@ -125,8 +124,8 @@ func DeserializeXfrmAddress(b []byte) *XfrmAddress {
 	return (*XfrmAddress)(unsafe.Pointer(&b[0:SizeofXfrmAddress][0]))
 }
 
-func (msg *XfrmAddress) Serialize() []byte {
-	return (*(*[SizeofXfrmAddress]byte)(unsafe.Pointer(msg)))[:]
+func (x *XfrmAddress) Serialize() []byte {
+	return (*(*[SizeofXfrmAddress]byte)(unsafe.Pointer(x)))[:]
 }
 
 // struct xfrm_selector {

protinfo.go

@@ -16,7 +16,7 @@ type Protinfo struct {
 
 // String returns a list of enabled flags
 func (prot *Protinfo) String() string {
-	boolStrings := make([]string, 0)
+	var boolStrings []string
 	if prot.Hairpin {
 		boolStrings = append(boolStrings, "Hairpin")
 	}

route_linux.go

@@ -119,7 +119,7 @@ func RouteList(link Link, family int) ([]Route, error) {
 	}
 
 	native := nl.NativeEndian()
-	res := make([]Route, 0)
+	var res []Route
 	for _, m := range msgs {
 		msg := nl.DeserializeRtMsg(m)
 
@@ -193,7 +193,7 @@ func RouteGet(destination net.IP) ([]Route, error) {
 	}
 
 	native := nl.NativeEndian()
-	res := make([]Route, 0)
+	var res []Route
 	for _, m := range msgs {
 		msg := nl.DeserializeRtMsg(m)
 		attrs, err := nl.ParseRouteAttr(m[msg.Len():])

xfrm_policy_linux.go

@@ -84,7 +84,7 @@ func XfrmPolicyList(family int) ([]XfrmPolicy, error) {
 		return nil, err
 	}
 
-	res := make([]XfrmPolicy, 0)
+	var res []XfrmPolicy
 	for _, m := range msgs {
 		msg := nl.DeserializeXfrmUserpolicyInfo(m)
 

xfrm_state_linux.go

@@ -118,7 +118,7 @@ func XfrmStateList(family int) ([]XfrmState, error) {
 		return nil, err
 	}
 
-	res := make([]XfrmState, 0)
+	var res []XfrmState
 	for _, m := range msgs {
 		msg := nl.DeserializeXfrmUsersaInfo(m)