enh: code optimization for tsdb path

source/dnode/vnode/src/tsdb/tsdbOpen.c

@@ -38,14 +38,14 @@ int tsdbOpen(SVnode *pVnode, STsdb **ppTsdb, const char *dir, STsdbKeepCfg *pKee
   int    slen = 0;
 
   *ppTsdb = NULL;
-  slen = TD_PATH_MAX;  //strlen(pVnode->path) + strlen(dir) + 3;
-
-  // if (slen > TD_PATH_MAX) {
-  //   terrno = TSDB_CODE_OUT_OF_RANGE;
-  //   tsdbError("vgId:%d, tsdb open failed since %s, path: %s%s%s", TD_VID(pVnode), terrstr(), pVnode->path, TD_DIRSEP,
-  //             dir);
-  //   return -1;
-  // }
+  slen = strlen(pVnode->path) + strlen(dir) + 3;
+
+  if (slen > TD_PATH_MAX) {
+    terrno = TSDB_CODE_OUT_OF_RANGE;
+    tsdbError("vgId:%d, tsdb open failed since %s, path: %s%s%s", TD_VID(pVnode), terrstr(), pVnode->path, TD_DIRSEP,
+              dir);
+    return -1;
+  }
 
   // create handle
   pTsdb = (STsdb *)taosMemoryCalloc(1, sizeof(*pTsdb) + slen);