nfs4: fix missing-braces warning

A bugfix introduced a harmless warning for update_open_stateid:

fs/nfs/nfs4proc.c:1548:2: error: missing braces around initializer [-Werror=missing-braces]

Removing the zero in the initializer will do the right thing here
and initialize the entire structure to zero.

Fixes: 1393d961 ("NFSv4: Fix a race when updating an open_stateid")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

fs/nfs/nfs4proc.c

@@ -1545,7 +1545,7 @@ static int update_open_stateid(struct nfs4_state *state,
 	struct nfs_client *clp = server->nfs_client;
 	struct nfs_inode *nfsi = NFS_I(state->inode);
 	struct nfs_delegation *deleg_cur;
-	nfs4_stateid freeme = {0};
+	nfs4_stateid freeme = { };
 	int ret = 0;
 
 	fmode &= (FMODE_READ|FMODE_WRITE);