rust: firmware: avoid UB in example by passing parameter

The `Firmware` example crafts an `ARef<Device>` using a null pointer,
which breaks the safety requirements of `Device::get_device()`.

Instead, pass an `ARef` via a parameter, which is simpler, avoids UB
and removes an `unsafe` block.

Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>
Reviewed-by: Gary Guo <gary@garyguo.net>
Link: https://patch.msgid.link/20260711180231.229525-1-ojeda@kernel.org
[ Also drop the second superfluous empty line. - Danilo ]
Signed-off-by: Danilo Krummrich <dakr@kernel.org>

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