tools/genromfs.c: Improve check for empty directories. If the directory contains only unsupported, special files, then it is still empty. Fix some collection of statistics that was cause statfs() to return some incorrect values. Add logic to handle the case where the host and the target differ in endian-ness. fs/procfs: In show mountpoints, add support so that the CROMFS file system type is recognized.

fs/mount/fs_gettype.c

@@ -1,7 +1,7 @@
 /****************************************************************************
  * fs/mount/fs_mount.c
  *
- *   Copyright (C) 2017 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2017-2018 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -84,6 +84,12 @@ FAR const char *fs_gettype(FAR struct statfs *statbuf)
         break;
 #endif
 
+#ifdef CONFIG_FS_CROMFS
+      case CROMFS_MAGIC:
+        fstype = "cromfs";
+        break;
+#endif
+
 #ifdef CONFIG_FS_TMPFS
       case TMPFS_MAGIC:
         fstype = "tmpfs";