e4defrag: fix segfault when e4defrag races with unlink/truncate

If a file gets deleted or truncated while e4defrag is trying to
operate on it, it's possible for it seg fault.

Addresses-Red-Hat-Bugzilla: #641926

Reported-by: Michal Piotrowski <mkkp4x4@gmail.com>
Signed-off-by: Kazuya Mio <k-mio@sx.jp.nec.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
1 file changed