Function dsv_log_init

DSView/pv/log.cpp:34–40

static int log_file_index = -1; 

void dsv_log_init()
{
    if (log_ctx == nullptr){
        log_ctx = xlog_new();  
        dsv_log = xlog_create_writer(log_ctx, "DSView"); 
    }
} 

void dsv_log_uninit()
{