The '\0' is written outside the bounds of the log buffer, which can
result in memory corruption or display issues with log messages.
Use a new constant LOG_BUF_SIZE to store the effective size of the
buffer in struct log_history.
Signed-off-by: Dongsu Han <dongsuh@cs.cmu.edu>
Signed-off-by: Olivier Matz <olivier.matz@6wind.com>
