Remove `pipe-stdout` after `module-loading` tests
Remove `pipe-stdout` after `module-loading` tests

The `tests/module-loading` tests leave behind a FIFO that isn't
removed by `git clean`, but that breaks `dpkg-source`.

This patch removes the FIFO after the test, either pass or fail.

strahlex/machinekit,strahlex/machinekit,strahlex/machinekit,strahlex/machinekit,strahlex/machinekit,strahlex/machinekit,strahlex/machinekit