ext4: silence warnings in extent status tree debugging code

Adjust the conversion specifications in a few optionally compiled debug
messages to match the return type of ext4_es_status().  Also, make a
couple of minor grammatical message edits while we're at it.

Signed-off-by: Eric Whitney <enwlinux@gmail.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>