fix: parent point of vnode found by VfsHashGet should be updated

When fatfs_lookup find a vnode from hashlist, the field parent of vnode should be updated,
because the old parent may be reclaimed.

Close #I3NNFA

fs/fat/os_adapt/fatfs.c

@@ -300,6 +300,7 @@ int fatfs_lookup(struct Vnode *parent, const char *path, int len, struct Vnode *
             goto ERROR_UNLOCK;
         }
     } else {
+        vp->parent = parent;
         free(dfp); /* hash hit dfp is no needed */
     }