Minor refactor in test class host

This reduces log noise for tests that reset the device under test

Author: ianrrees

tests/test_class_host/device.rs

@@ -65,13 +65,7 @@ impl DeviceHandles {
 
     /// Cleanup the device following a test
     pub fn post_test(&mut self) -> rusb::Result<()> {
-        let res = self.release_interface(TEST_INTERFACE);
-        if let Err(err) = res {
-            println!("Failed to release interface: {}", err);
-            return res;
-        }
-
-        Ok(())
+        self.release_interface(TEST_INTERFACE)
     }
 }
 

tests/test_class_host/main.rs

@@ -43,7 +43,10 @@ fn run_tests(tests: &[(&str, TestFn)]) {
             res
         };
 
-        ctx.cleanup_after_test().expect("post test cleanup failed");
+        if let Err(err) = ctx.cleanup_after_test() {
+            println!("Failed to release interface: {}", err);
+            panic!("post test cleanup failed");
+        }
 
         if let Err(err) = res {
             let err = if let Some(err) = err.downcast_ref::<&'static str>() {