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Fix FP compilation warning in func_adapter test

When I use LTO and warning-as-an-error locally with GCC 13 I got the
following build failure:

```c
In function ‘test_func_adapter_func_is_pinned’,
    inlined from ‘test_main’ at <...>/test/unit/func_adapter_func.c:142:2,
    inlined from ‘main’ at <...>/test/unit/func_adapter_func.c:163:11:
<...>/test/unit/func_adapter_func.c:124:17: error: ‘returned_pin_type’ may be used uninitialized [-Werror=maybe-uninitialized]
  124 |                 is(returned_pin_type, pin_type,
      |                 ^
<...>/test/unit/func_adapter_func.c: In function ‘main’:
<...>/test/unit/func_adapter_func.c:121:39: note: ‘returned_pin_type’ was declared here
  121 |                 enum func_holder_type returned_pin_type;
      |                                       ^
lto1: all warnings being treated as errors
```

The build command:

```sh
cmake -S . -B . -DCMAKE_BUILD_TYPE=RelWithDebInfo -DENABLE_WERROR=ON -DTEST_BUILD=ON -DENABLE_LTO=ON
```

The fix is suggested by Andrey Saranchin (@drewdzzz).

This problem surprisingly happens in CI on increasing cmake minimum
version to 3.5 (see #11382). Not sure about a reason, but since it hits
me on `master` without any patches, that's definitely worth to fix.

While I'm here, initialize the `enum func_holder_type` variables in the
`func_cache` unit test.

NO_DOC=compilation fix
NO_TEST=compilation fix
NO_CHANGELOG=compilation fix

(cherry picked from commit ca4bdb052)

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