Merge pull request #1652 from taosdata/enhance/sdbWal

potential memory leak if no any wal files

src/wal/src/walMain.c

@@ -208,6 +208,8 @@ int walRestore(void *handle, void *pVnode, int (*writeFp)(void *, void *, int))
     }
   }
 
+  closedir(dir);
+
   if (count == 0) {
     if (pWal->keep) code = walRenew(pWal);
     return code;
@@ -248,8 +250,6 @@ int walRestore(void *handle, void *pVnode, int (*writeFp)(void *, void *, int))
     }
   }
 
-  closedir(dir);
-
   return code;
 }