tcmu: Fix trailing semicolon

The trailing semicolon is an empty statement that does no operation.
It is completely stripped out by the compiler. Removing it since it doesn't do
anything.
Signed-off-by: Luis de Bethencourt <luisbg@kernel.org>
Acked-by: Mike Christie <mchristi@redhat.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

drivers/target/target_core_user.c

@@ -1583,7 +1583,7 @@ static int tcmu_wait_genl_cmd_reply(struct tcmu_dev *udev)
 
 	wake_up_all(&udev->nl_cmd_wq);
 
-	return ret;;
+	return ret;
 }
 
 static int tcmu_netlink_event(struct tcmu_dev *udev, enum tcmu_genl_cmd cmd,