Update easylogger/src/elog_buf.c

Co-authored-by: 朱天龙 (Armink) <armink.ztl@gmail.com>

easylogger/src/elog_buf.c

@@ -82,7 +82,7 @@ void elog_buf_output(const char *log, size_t size) {
  * flush all buffered logs to output device
  */
 void elog_flush(void) {
-    if(!buf_write_size)
+    if (buf_write_size == 0)
         return;
     /* lock output */
     elog_output_lock();