debugfs: clean up read_journal_block() to avoid Coverity complaint

The read_journal_block() function was needlessly complicated, which
made it harder to read/maintain, and it also tripped up Coverity.
Cleaning it up also avoided some signed/unsigned casts, and allows us
to avoid passing got back to the caller, since it wasn't needed.

Addresses-Coverity-Bug: #709539

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