fix(alsa): safe join on Drop (#1098)

Author: Roms1383

src/host/alsa/mod.rs

@@ -1204,7 +1204,9 @@ impl Drop for Stream {
     fn drop(&mut self) {
         self.inner.dropping.store(true, Ordering::Release);
         self.trigger.wakeup();
-        self.thread.take().unwrap().join().unwrap();
+        if let Some(handle) = self.thread.take() {
+            let _ = handle.join();
+        }
     }
 }
 

src/host/wasapi/stream.rs

@@ -178,7 +178,9 @@ impl Stream {
 impl Drop for Stream {
     fn drop(&mut self) {
         if self.push_command(Command::Terminate).is_ok() {
-            self.thread.take().unwrap().join().unwrap();
+            if let Some(handle) = self.thread.take() {
+                let _ = handle.join();
+            }
             unsafe {
                 let _ = Foundation::CloseHandle(self.pending_scheduled_event);
             }