add missing va_end() call to logger_log()
add missing va_end() call to logger_log()

dormando/memcached,memcached/memcached,memcached/memcached,dormando/memcached,dormando/memcached,dormando/memcached,dormando/memcached,memcached/memcached,memcached/memcached,memcached/memcached