RPi compile warnings

[gingibash]

Compiling gstreamer-audio v0.17.2
warning: field is never read: xbase
--> src/receiver.rs:254:5
|
254 | xbase: u64,
| ^^^^^^^^^^
|
= note: #[warn(dead_code)] on by default

warning: field is never read: b
--> src/receiver.rs:255:5
|
255 | b: u64,
| ^^^^^^

warning: field is never read: num
--> src/receiver.rs:256:5
|
256 | num: u64,
| ^^^^^^^^

warning: field is never read: den
--> src/receiver.rs:257:5
|
257 | den: u64,
| ^^^^^^^^

warning: gst-plugin-ndi (lib) generated 4 warnings

[sdroege]

That's fixed by the second commit in #91