e2fsck: Interpret negative blkcount in file system problem reports

Non-expert users get confused when they see messages like this:

Illegal block #-1 (2291965952) in inode 176. CLEARED.

So change it to be something a little bit more understandable:

Illegal indirect block (2291965952) in inode 176.  CLEARED.

Addresses-SourceForge-Bug: #2871782

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
10 files changed