Fix blacklist_reason
Fix blacklist_reason

Use reply->len instead of calculating the length of the string
response. Make sure to terminate the string as well.

repsheet/librepsheet,prokopowicz/librepsheet,repsheet/librepsheet,repsheet/librepsheet,prokopowicz/librepsheet,davidhanley/librepsheet,davidhanley/librepsheet,prokopowicz/librepsheet,davidhanley/librepsheet