fix: logger PrintD("") 内存泄漏的问题

# man vasprintf

RETURN VALUE
       When successful, these functions return the number of bytes printed, just like sprintf(3).  If memory allocation wasn't possible, or some other error occurs, these functions will return -1, and the contents of strp are undefined.

src/Util/logger.cpp

@@ -627,7 +627,7 @@ void FileChannel::setFileMaxCount(size_t max_count) {
 void LoggerWrapper::printLogV(Logger &logger, int level, const char *file, const char *function, int line, const char *fmt, va_list ap) {
     LogContextCapture info(logger, (LogLevel) level, file, function, line);
     char *str = nullptr;
-    if (vasprintf(&str, fmt, ap) > 0 && str) {
+    if (vasprintf(&str, fmt, ap) >= 0 && str) {
         info << str;
 #ifdef ASAN_USE_DELETE
         delete [] str; // 开启asan后，用free会卡死