NFSv4: Fix a credential leak in _nfs4_discover_trunking()

Fixes: 4f40a5b5 ("NFSv4: Add an fattr allocation to _nfs4_discover_trunking()")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>

fs/nfs/nfs4proc.c

@@ -4018,7 +4018,7 @@ static int _nfs4_discover_trunking(struct nfs_server *server,
 
 	page = alloc_page(GFP_KERNEL);
 	if (!page)
-		return -ENOMEM;
+		goto out_put_cred;
 	locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
 	if (!locations)
 		goto out_free;
@@ -4040,6 +4040,8 @@ static int _nfs4_discover_trunking(struct nfs_server *server,
 	kfree(locations);
 out_free:
 	__free_page(page);
+out_put_cred:
+	put_cred(cred);
 	return status;
 }