Removing un-needed go func (#4939)

api/channel.go

@@ -634,7 +634,6 @@ func AddUserToChannel(user *model.User, channel *model.Channel) (*model.ChannelM
 		return nil, model.NewLocAppError("AddUserToChannel", "api.channel.add_user.to.channel.failed.app_error", nil, "")
 	}
 
-	go func() {
 	InvalidateCacheForUser(user.Id)
 	InvalidateCacheForChannel(channel.Id)
 
@@ -642,7 +641,6 @@ func AddUserToChannel(user *model.User, channel *model.Channel) (*model.ChannelM
 	message.Add("user_id", user.Id)
 	message.Add("team_id", channel.TeamId)
 	go Publish(message)
-	}()
 
 	return newMember, nil
 }