!449 确保BBOX抓取的故障日志落盘

Merge pull request !449 from pcwlno1/bugfix_log_write

kernel/common/blackbox/los_blackbox_common.c

@@ -78,6 +78,7 @@ int FullWriteFile(const char *filePath, const char *buf, size_t bufSize, int isA
         totalToWrite -= writeThisTime;
         totalWrite += writeThisTime;
     }
+    (void)fsync(fd);
     (void)close(fd);
 
     return (totalWrite == (int)bufSize) ? 0 : -1;