Fix printing of variables passed in to the logger

src/common/logging.hpp

@@ -105,6 +105,7 @@ class Logger {
       char buf[1024];
       memset(buf, 0, 1024*sizeof(char));
       va_list args;
+      va_start(args, fmt);
       vsnprintf(buf, 1024, fmt, args);
       for (int i = 0; i < this->fd_count ; i++) {
          fprintf(this->fds[i], "[%s]\t%s\n", this->mapLevel(level), buf);