Fix lint issues

The package updated and now shows new warnings that had to be corrected
to let the CI pass

Signed-off-by: Flavio Crisciani <flavio.crisciani@docker.com>

cmd/dnet/dnet.go

@@ -412,11 +412,7 @@ func startTestDriver() error {
 		return err
 	}
 
-	if err := ioutil.WriteFile("/etc/docker/plugins/test.spec", []byte(server.URL), 0644); err != nil {
-		return err
-	}
-
-	return nil
+	return ioutil.WriteFile("/etc/docker/plugins/test.spec", []byte(server.URL), 0644)
 }
 
 func newDnetConnection(val string) (*dnetConnection, error) {

drivers/bridge/bridge.go

@@ -763,11 +763,7 @@ func (d *driver) createNetwork(config *networkConfiguration) error {
 
 	// Apply the prepared list of steps, and abort at the first error.
 	bridgeSetup.queueStep(setupDeviceUp)
-	if err = bridgeSetup.apply(); err != nil {
-		return err
-	}
-
-	return nil
+	return bridgeSetup.apply()
 }
 
 func (d *driver) DeleteNetwork(nid string) error {

drivers/bridge/setup_ip_tables.go

@@ -169,11 +169,7 @@ func setupIPTablesInternal(bridgeIface string, addr net.Addr, icc, ipmasq, hairp
 	}
 
 	// Set Accept on all non-intercontainer outgoing packets.
-	if err := programChainRule(outRule, "ACCEPT NON_ICC OUTGOING", enable); err != nil {
-		return err
-	}
-
-	return nil
+	return programChainRule(outRule, "ACCEPT NON_ICC OUTGOING", enable)
 }
 
 func programChainRule(rule iptRule, ruleDescr string, insert bool) error {
@@ -304,10 +300,7 @@ func setupInternalNetworkRules(bridgeIface string, addr net.Addr, icc, insert bo
 		return err
 	}
 	// Set Inter Container Communication.
-	if err := setIcc(bridgeIface, icc, insert); err != nil {
-		return err
-	}
-	return nil
+	return setIcc(bridgeIface, icc, insert)
 }
 
 func clearEndpointConnections(nlh *netlink.Handle, ep *bridgeEndpoint) {

drivers/overlay/ov_endpoint.go

@@ -144,22 +144,15 @@ func (d *driver) deleteEndpointFromStore(e *endpoint) error {
 		return fmt.Errorf("overlay local store not initialized, ep not deleted")
 	}
 
-	if err := d.localStore.DeleteObjectAtomic(e); err != nil {
-		return err
-	}
-
-	return nil
+	return d.localStore.DeleteObjectAtomic(e)
 }
 
 func (d *driver) writeEndpointToStore(e *endpoint) error {
 	if d.localStore == nil {
 		return fmt.Errorf("overlay local store not initialized, ep not added")
 	}
 
-	if err := d.localStore.PutObjectAtomic(e); err != nil {
-		return err
-	}
-	return nil
+	return d.localStore.PutObjectAtomic(e)
 }
 
 func (ep *endpoint) DataScope() string {

drivers/solaris/overlay/ov_endpoint.go

@@ -134,22 +134,15 @@ func (d *driver) deleteEndpointFromStore(e *endpoint) error {
 		return fmt.Errorf("overlay local store not initialized, ep not deleted")
 	}
 
-	if err := d.localStore.DeleteObjectAtomic(e); err != nil {
-		return err
-	}
-
-	return nil
+	return d.localStore.DeleteObjectAtomic(e)
 }
 
 func (d *driver) writeEndpointToStore(e *endpoint) error {
 	if d.localStore == nil {
 		return fmt.Errorf("overlay local store not initialized, ep not added")
 	}
 
-	if err := d.localStore.PutObjectAtomic(e); err != nil {
-		return err
-	}
-	return nil
+	return d.localStore.PutObjectAtomic(e)
 }
 
 func (ep *endpoint) DataScope() string {

endpoint_info.go

@@ -202,11 +202,7 @@ func (ep *endpoint) Info() EndpointInfo {
 		return ep
 	}
 
-	if epi := sb.getEndpoint(ep.ID()); epi != nil {
-		return epi
-	}
-
-	return nil
+	return sb.getEndpoint(ep.ID())
 }
 
 func (ep *endpoint) Iface() InterfaceInfo {

iptables/iptables.go

@@ -276,11 +276,7 @@ func (c *ChainInfo) Forward(action Action, ip net.IP, port int, proto, destAddr
 		"--dport", strconv.Itoa(destPort),
 		"-j", "MASQUERADE",
 	}
-	if err := ProgramRule(Nat, "POSTROUTING", action, args); err != nil {
-		return err
-	}
-
-	return nil
+	return ProgramRule(Nat, "POSTROUTING", action, args)
 }
 
 // Link adds reciprocal ACCEPT rule for two supplied IP addresses.
@@ -301,10 +297,7 @@ func (c *ChainInfo) Link(action Action, ip1, ip2 net.IP, port int, proto string,
 	// reverse
 	args[7], args[9] = args[9], args[7]
 	args[10] = "--sport"
-	if err := ProgramRule(Filter, c.Name, action, args); err != nil {
-		return err
-	}
-	return nil
+	return ProgramRule(Filter, c.Name, action, args)
 }
 
 // ProgramRule adds the rule specified by args only if the

sandbox_dns_unix.go

@@ -67,11 +67,7 @@ func (sb *sandbox) setupResolutionFiles() error {
 		return err
 	}
 
-	if err := sb.setupDNS(); err != nil {
-		return err
-	}
-
-	return nil
+	return sb.setupDNS()
 }
 
 func (sb *sandbox) buildHostsFile() error {