audio_output/winstore: do the MTA+lock before setting the initial device

The requested device is set to the default one in Open and requires the MTA
setup in order for the activation to work. Otherwise it deadlocks.

modules/audio_output/winstore.c

@@ -431,6 +431,10 @@ static int Start(audio_output_t *aout, audio_sample_format_t *restrict fmt)
     if (unlikely(s == NULL))
         return -1;
 
+    // Load the "out stream" for the requested device
+    EnterMTA();
+    EnterCriticalSection(&sys->lock);
+
     if (sys->requested_device != NULL)
     {
         if (sys->acquired_device == NULL || wcscmp(sys->acquired_device, sys->requested_device))
@@ -439,16 +443,14 @@ static int Start(audio_output_t *aout, audio_sample_format_t *restrict fmt)
             DeviceRestartLocked(aout);
             if (sys->client == NULL)
             {
+                LeaveCriticalSection(&sys->lock);
+                LeaveMTA();
                 vlc_object_delete(&s->obj);
                 return -1;
             }
         }
     }
 
-    // Load the "out stream" for the requested device
-    EnterMTA();
-    EnterCriticalSection(&sys->lock);
-
     s->owner.activate = ActivateDevice;
     for (;;)
     {