Raylib::updateCamera() segfaults if FFI::addr() is returned from another method

[nawarian]

This was found while implementing the Raylib::updateCamera() method. The snippet below can reproduce the issue:

public function updateCamera(Types\Camera3D $camera): void
{
    $cdata = FFI::addr($camera->toCData($this->ffi));
    $this->ffi->UpdateCamera($cdata);
    // ...
}

public function getAddr(\FFI\CData $cdata): \FFI\CData
{
    return FFI::addr($cdata);
}

If $cdata = FFI::addr($camera->toCData($this->ffi)); is replaced with $cdata = $this->getAddr($camera->toCData($this->ffi)); PHP will segfault.