#include "common.h"static void dump_folder_list(LIBMTP_folder_t *folderlist, int level){  int i;  if(folderlist==NULL) {    return;  }  printf("%u\t", folderlist->folder_id);  for(i=0;i<level;i++) printf("  ");  printf("%s\n", folderlist->name);  dump_folder_list(folderlist->child, level+1);  dump_folder_list(folderlist->sibling, level);}int main (int argc, char **argv){  LIBMTP_mtpdevice_t *device;  LIBMTP_folder_t *folders;  LIBMTP_Init();  device = LIBMTP_Get_First_Device();  if (device == NULL) {    printf("No devices.\n");    exit (0);  }    // Get folder listing.  folders = LIBMTP_Get_Folder_List(device);    if(folders == NULL) {    printf("No folders found\n");  } else {    dump_folder_list(folders,0);  }  LIBMTP_destroy_folder_t(folders);  LIBMTP_Release_Device(device);  printf("OK.\n");  exit (0);}