selftest/net/ipsec.c: Remove unneeded semicolon

fix semicolon.cocci warning:
tools/testing/selftests/net/ipsec.c:1788:2-3: Unneeded semicolon
Signed-off-by: NXu Wang <vulab@iscas.ac.cn>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

tools/testing/selftests/net/ipsec.c

@@ -1785,7 +1785,7 @@ static void grand_child_serv(unsigned int nr, int cmd_fd, void *buf,
 		break;
 	default:
 		printk("got unknown msg type %d", msg->type);
-	};
+	}
 }
 
 static int grand_child_f(unsigned int nr, int cmd_fd, void *buf)