e2fsck: improve the "superblock corrupt" message

Previously, this message used 8193 as the example alternate
superblock.  But for most file systems, the backup superblock is
located at 32768 (since most file systems have a block size of 4k, and
not 1k).

Addresses-Debian-Bug: #719185

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