[Toybox] [PATCH] Try to debug modinfo test flake.

[enh]

We're seeing (rare) flake in CI, without enough information to even
guess what the problem might be:
```
FAIL: modinfo -F filename gets absolute path
echo -ne '' | modinfo -F filename
--- expected 2023-05-09 07:43:19.487000369 +0000
+++ actual 2023-05-09 07:43:19.507000369 +0000
@@ -1 +0,0 @@
-
```

Maybe at least knowing the module name will help?
---
 tests/modinfo.test | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
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