thunderbolt: Fix memory leak in tb_handle_dp_bandwidth_request()

commit 596a512 upstream.

The memory allocated in tb_queue_dp_bandwidth_request() needs to be
released once the request is handled to avoid leaking it.

Fixes: 6ce3563 ("thunderbolt: Add support for DisplayPort bandwidth allocation mode")
Cc: stable@vger.kernel.org
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/thunderbolt/tb.c

@@ -1810,6 +1810,8 @@ static void tb_handle_dp_bandwidth_request(struct work_struct *work)
 
 	pm_runtime_mark_last_busy(&tb->dev);
 	pm_runtime_put_autosuspend(&tb->dev);
+
+	kfree(ev);
 }
 
 static void tb_queue_dp_bandwidth_request(struct tb *tb, u64 route, u8 port)