fix: fix coverity scan

source/libs/stream/src/streamState.c

@@ -130,21 +130,25 @@ SStreamState* streamStateOpen(char* path, SStreamTask* pTask, bool specPath, int
   char cfgPath[1030];
   sprintf(cfgPath, "%s/cfg", statePath);
 
+  szPage = szPage < 0 ? 4096 : szPage;
+  pages = pages < 0 ? 256 : pages;
   char cfg[1024];
   memset(cfg, 0, 1024);
   TdFilePtr pCfgFile = taosOpenFile(cfgPath, TD_FILE_READ);
   if (pCfgFile != NULL) {
-    int64_t size;
+    int64_t size = 0;
     taosFStatFile(pCfgFile, &size, NULL);
-    taosReadFile(pCfgFile, cfg, size);
-    sscanf(cfg, "%d\n%d\n", &szPage, &pages);
+    if (size > 0) {
+      taosReadFile(pCfgFile, cfg, size);
+      sscanf(cfg, "%d\n%d\n", &szPage, &pages);
+    }
   } else {
-    taosMulModeMkDir(statePath, 0755);
-    pCfgFile = taosOpenFile(cfgPath, TD_FILE_WRITE | TD_FILE_CREATE);
-    szPage = szPage < 0 ? 4096 : szPage;
-    pages = pages < 0 ? 256 : pages;
-    sprintf(cfg, "%d\n%d\n", szPage, pages);
-    taosWriteFile(pCfgFile, cfg, strlen(cfg));
+    int32_t code = taosMulModeMkDir(statePath, 0755);
+    if (code == 0) {
+      pCfgFile = taosOpenFile(cfgPath, TD_FILE_WRITE | TD_FILE_CREATE);
+      sprintf(cfg, "%d\n%d\n", szPage, pages);
+      taosWriteFile(pCfgFile, cfg, strlen(cfg));
+    }
   }
   taosCloseFile(&pCfgFile);