filefrag: Fix uninitialized "expected" value

filefrag: Fix uninitialized "expected" value

The "count" variable is only ever set if FIBMAP is used,
due to the -B switch, or a fiemap failure.  However,
we use it unconditionally to calculate "expected" for
extN files, so we can end up printing garbage.

Initialize count to 0, and unless we go through the FIBMAP
path, expected will be 0 as well, and in that case do not
print the message.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>