dfs_cache: fix a wrong use of kfree in flush_cache_ent()

In flush_cache_ent(), 'ce->ce_path' is allocated by kstrdup_const().
It should be freed by kfree_const(), rather than kfree().
Signed-off-by: Gen Zhang <blackgod016574@gmail.com>
Reviewed-by: Paulo Alcantara <palcantara@suse.de>
Signed-off-by: Steve French <stfrench@microsoft.com>

fs/cifs/dfs_cache.c

@@ -132,7 +132,7 @@ static inline void flush_cache_ent(struct dfs_cache_entry *ce)
 		return;
 
 	hlist_del_init_rcu(&ce->ce_hlist);
-	kfree(ce->ce_path);
+	kfree_const(ce->ce_path);
 	free_tgts(ce);
 	dfs_cache_count--;
 	call_rcu(&ce->ce_rcu, free_cache_entry);
@@ -422,7 +422,7 @@ alloc_cache_entry(const char *path, const struct dfs_info3_param *refs,
 
 	rc = copy_ref_data(refs, numrefs, ce, NULL);
 	if (rc) {
-		kfree(ce->ce_path);
+		kfree_const(ce->ce_path);
 		kmem_cache_free(dfs_cache_slab, ce);
 		ce = ERR_PTR(rc);
 	}