fix: port the fixing of issue 13529 from develop to 2.6

src/tsdb/inc/tsdbFile.h

@@ -257,7 +257,13 @@ static FORCE_INLINE int tsdbAppendDFile(SDFile* pDFile, void* buf, int64_t nbyte
     return -1;
   }
 
-  ASSERT(pDFile->info.size == toffset);
+  //bug fix. To avoid data corruption,
+  //the end offset of current file should be checked with file size,
+  //if not equal, known as file corrupted and return error.
+  if (pDFile->info.size != toffset) {
+    terrno = TSDB_CODE_TDB_FILE_CORRUPTED;
+    return -1;
+  }
 
   if (offset) {
     *offset = toffset;