[patch] i40e: remove a stray unlock

[Dan Carpenter]

We shifted the locking around a bit but forgot to delete this unlock so
now it can unlock twice.

Fixes: cd3be169a5ff ('i40e: Move the mutex lock in i40e_client_unregister')
Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>

diff --git a/drivers/net/ethernet/intel/i40e/i40e_client.c 
b/drivers/net/ethernet/intel/i40e/i40e_client.c
index e1370c5..1a9682f 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_client.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_client.c
@@ -990,7 +990,6 @@ int i40e_unregister_client(struct i40e_client *client)
        if (!i40e_client_is_registered(client)) {
                pr_info("i40e: Client %s has not been registered\n",
                        client->name);
-               mutex_unlock(&i40e_client_mutex);
                ret = -ENODEV;
                goto out;
        }