IB/umad: Remove unused-but-set variable 'already_dead'

Signed-off-by: Roland Dreier <rolandd@cisco.com>

drivers/infiniband/core/user_mad.c

@@ -1085,7 +1085,6 @@ err_cdev:
 static void ib_umad_kill_port(struct ib_umad_port *port)
 {
 	struct ib_umad_file *file;
-	int already_dead;
 	int id;
 
 	dev_set_drvdata(port->dev,    NULL);
@@ -1103,7 +1102,6 @@ static void ib_umad_kill_port(struct ib_umad_port *port)
 
 	list_for_each_entry(file, &port->file_list, port_list) {
 		mutex_lock(&file->mutex);
-		already_dead = file->agents_dead;
 		file->agents_dead = 1;
 		mutex_unlock(&file->mutex);