Marco Trevisan (Treviño) 355cae1bbd fp-device: Return error if trying to list a storage-less device ...

Devices with no storage don't allow listing prints, and if we try to do
that, we'd end up in trying to call a NULL function pointer, causing a crash

So always check if the device has storage before calling the list vfunc, and
if we fail, return an error.

Include an unit-test to verify this situation

2020-02-10 11:41:40 +01:00

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