dm log writes: fix max length used for kstrndup

If source string is longer than max, kstrndup will allocate max+1
space.  So make sure the result will not exceed max.

Signed-off-by: Ma Shimiao <mashimiao.fnst@cn.fujitsu.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
1 file changed