chore: time unit of os uptime

source/dnode/mgmt/mgmt_dnode/src/dmWorker.c

@@ -43,7 +43,7 @@ static void *dmStatusThreadFp(void *param) {
       }
 
       if ((upTimeCount = (++upTimeCount & 63)) == 0) {
-        upTime = (taosGetOsUptime() - tsDndStartOsUptime) * 1000;
+        upTime = taosGetOsUptime() - tsDndStartOsUptime;
         tsDndUpTime = TMAX(tsDndUpTime, upTime);
       }
     }

source/os/src/osSysinfo.c

@@ -967,7 +967,7 @@ int64_t taosGetOsUptime() {
 #else
   struct sysinfo info;
   if (0 == sysinfo(&info)) {
-    return info.uptime;
+    return (int64_t)info.uptime * 1000;
   };
 #endif
   return 0;