Fixes: #327
This removes redundunt check for the number of log files. The whole
'struct va_trace' is being calloc-d and we can just check that
pointers to log files are valid instead of relying on number of
active log files.
Signed-off-by: fandehui <fandehui@xfusion.com>
(cherry picked from commit 7fe2044d77b212a5a835fd186801fa8140f0f6f7)
