Fixes for ext4fixup.

Add check for filesystem that needs the journal run
Fix check for a cleanly unmounted filesystem.
Fix computation of new inode number
Fix check in two places for high bit being set on inode num
Only run sanity check pass if filesystem fixup state is unset
  (i.e. not partway through the conversion)

Change-Id: Ib5521e7f3c04d32c02d9890644a99378e3a3659e
2 files changed