sys/log/full: Fix buffer overrun
In `log_fcb_copy_entry()`, the code was null-terminating the destination
buffer without reserving space for the terminator.
Null termination is not necessary here.  We are just copying an entry
from one FCB to another, so there is no need to modify the entry body.
@@ -681,7 +681,6 @@ log_fcb_copy_entry(struct log *log, struct fcb_entry *entry,
if (rc < 0) {
goto err;
}
- data[rc] = '\0';
/* Changing the fcb to be logged to be dst fcb */
fcb_tmp = &((struct fcb_log *)log->l_arg)->fl_fcb;
