[PATCH 3/4] tty: n_gsm: Remove an unused lock

[Dan Carpenter]

We don't use this spin_lock so we can remove the dead code.

Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>

diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c
index 1f2fd9e76fe0..44e9c5e3dbc1 100644
--- a/drivers/tty/n_gsm.c
+++ b/drivers/tty/n_gsm.c
@@ -177,7 +177,6 @@ struct gsm_control {
 
 struct gsm_mux {
        struct tty_struct *tty;         /* The tty our ldisc is bound to */
-       spinlock_t lock;
        struct mutex mutex;
        unsigned int num;
        struct kref ref;
@@ -2188,7 +2187,6 @@ static struct gsm_mux *gsm_alloc_mux(void)
                kfree(gsm);
                return NULL;
        }
-       spin_lock_init(&gsm->lock);
        mutex_init(&gsm->mutex);
        kref_init(&gsm->ref);
        INIT_LIST_HEAD(&gsm->tx_list);