vst: handle result output from init

gb-vst/src/plugin.rs

@@ -324,6 +324,7 @@ impl Plugin for GameboyEmu {
                 .with_show_bootrom(!will_skip_bootrom);
 
                 EmulatorCore::init(false, receiver, options)
+                    .expect("couldn't initialize emulator core!")
             };
 
             emulator_core.run_until_buffer_full();