getSn confliction

opencv-motion-detect/database.cpp

@@ -378,10 +378,10 @@ togo_end:
         int ret = 0;
         int cnt = 0;
 
-        while(ret < 0 && cnt < 3) {
+        do{
             ret = getValue(info, LVDB_KEY_SN, fileName, _validateSn);
             cnt++;
-        }
+        }while(ret < 0 && cnt < 3);
 
         if(ret < 0) {
             // read from text config

opencv-motion-detect/evdaemon.cpp

@@ -938,10 +938,14 @@ public:
         // get sn of device
         json info;
         try {
-            LVDB::getSn(info);
+            ret = LVDB::getSn(info);
         }
         catch(exception &e) {
             spdlog::error("evdaemon failed to get local info: {}", e.what());
+            ret = -1;
+        }
+        if(ret != 0) {
+            spdlog::error("fatal error: evdaemon failed to get/set SN");
             exit(1);
         }