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New mkfs.ext3 also set min_extra_isize, and thus are misqualified as ext4, ...

  - Rene Rebe <rene@exactcode.de>

--- disktype/linux.c.vanilla	2010-02-06 14:09:54.000000000 +0000
+++ disktype/linux.c	2010-02-06 14:09:18.000000000 +0000
@@ -60,9 +60,11 @@
     /* Ext4 RO_COMPAT features: HUGE_FILE, GDT_CSUM, DIR_NLINK, EXTRA_ISIZE */
     if (get_le_long(buf + 100) & 0x0078)
       fslevel = 4;
+#if 0
     /* Ext4 sets min_extra_isize even on external journals */
     if (get_le_short(buf + 348) >= 0x1c)
       fslevel = 4;
+#endif
     /* Ext4dev TEST_FILESYS flag */
     if (get_le_long(buf + 352) & 0x0004)
       is_dev = 1;