made getDefaultNetworkMtu private

Signed-off-by: Blake Geno <blakegeno@gmail.com>

daemon/config.go

@@ -70,7 +70,7 @@ func (config *Config) InstallFlags() {
 	opts.MirrorListVar(&config.Mirrors, []string{"-registry-mirror"}, "Specify a preferred Docker registry mirror")
 }
 
-func GetDefaultNetworkMtu() int {
+func getDefaultNetworkMtu() int {
 	if iface, err := networkdriver.GetDefaultRouteIface(); err == nil {
 		return iface.MTU
 	}

daemon/daemon.go

@@ -721,8 +721,7 @@ func NewDaemon(config *Config, eng *engine.Engine) (*Daemon, error) {
 func NewDaemonFromDirectory(config *Config, eng *engine.Engine) (*Daemon, error) {
 	// Apply configuration defaults
 	if config.Mtu == 0 {
-		// FIXME: GetDefaultNetwork Mtu doesn't need to be public anymore
-		config.Mtu = GetDefaultNetworkMtu()
+		config.Mtu = getDefaultNetworkMtu()
 	}
 	// Check for mutually incompatible config options
 	if config.BridgeIface != "" && config.BridgeIP != "" {