We already skip storing data where compression does not make the result
at least one byte less.  Let's make the logic better and check
that compression frees at least one sector size of bytes, otherwise it's
not that useful.
Signed-off-by: NTimofey Titovets <nefelim4ag@gmail.com>
Reviewed-by: NDavid Sterba <dsterba@suse.com>
[ changelog updated ]
Signed-off-by: NDavid Sterba <dsterba@suse.com>