winepulse: Adapt "is_started_params" struct to mmdevapi's.

dlls/winepulse.drv/mmdevdrv.c

@@ -2021,7 +2021,7 @@ static HRESULT WINAPI AudioSessionControl_GetState(IAudioSessionControl2 *iface,
 
         params.stream = client->pulse_stream;
         pulse_call(is_started, &params);
-        if (params.started) {
+        if (params.result == S_OK) {
             *state = AudioSessionStateActive;
             goto out;
         }

dlls/winepulse.drv/pulse.c

@@ -2258,7 +2258,7 @@ static NTSTATUS pulse_is_started(void *args)
     struct pulse_stream *stream = handle_get_stream(params->stream);
 
     pulse_lock();
-    params->started = pulse_stream_valid(stream) && stream->started;
+    params->result = pulse_stream_valid(stream) && stream->started ? S_OK : S_FALSE;
     pulse_unlock();
 
     return STATUS_SUCCESS;

dlls/winepulse.drv/unixlib.h

@@ -214,7 +214,7 @@ struct test_connect_params
 struct is_started_params
 {
     stream_handle stream;
-    BOOL started;
+    HRESULT result;
 };
 
 struct get_prop_value_params