test: fix usage of FILE in unit test fapi-io #2423
Merged
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The unit test had a static FILE structure used to pass to stdio FILE * routines as a dummy value to indicate to use the __real_xxx variant of the mocked function. This doesn't work when FILE is opaque as the compiler cannot figure out how much storage space is needed for a FILE struct.
Fix this by passing a dummy pointer to a data type the compiler knows about and casting it to FILE pointer.
Fixes: #2419
Signed-off-by: William Roberts william.c.roberts@intel.com