winecfg/audio: properly terminate empty list of drivers.

[Kirill K. Smirnov]

If no driver is found, drivers list should be terminated with empty driver, 
not just zeroes (bug 15699 causa).
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@@ -548,8 +533,10 @@ static void findAudioDrivers(void)
     if (numFound) {
         loadedAudioDrv = HeapReAlloc(GetProcessHeap(), 0, loadedAudioDrv, (numFound + 1) * sizeof(AUDIO_DRIVER));
         CopyMemory(&loadedAudioDrv[numFound], pAudioDrv, sizeof(AUDIO_DRIVER));
-    } else
-        loadedAudioDrv = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(AUDIO_DRIVER));
+    } else {
+        loadedAudioDrv = HeapAlloc(GetProcessHeap(), 0, sizeof(AUDIO_DRIVER));
+        CopyMemory(&loadedAudioDrv[0], pAudioDrv, sizeof(AUDIO_DRIVER));
+    }
 }
 
 /* check local copy of registry string for unloadable drivers */