fixup! sound: add unit tests to alsa backend

Author: epilys

staging/vhost-device-sound/src/audio_backends/alsa/test_utils.rs

@@ -113,7 +113,12 @@ impl Drop for AlsaTestHarness {
                 stringify!(AlsaTestHarness)
             );
         }
-        if self.tempdir.take().is_some() {
+        if self
+            .tempdir
+            .lock()
+            .map(|mut l| l.take().is_some())
+            .unwrap_or(false)
+        {
             println!(
                 "ERROR: tempdir held a value when dropping {}",
                 stringify!(AlsaTestHarness)