winecoreaudio: Fix latency calculation.

dlls/winecoreaudio.drv/mmdevdrv.c

@@ -1210,8 +1210,8 @@ static HRESULT WINAPI AudioClient_GetStreamLatency(IAudioClient *iface,
     latency += stream_latency;
     /* pretend we process audio in Period chunks, so max latency includes
      * the period time */
-    latency += DefaultPeriod;
-    *out = (latency / (double)This->fmt->nSamplesPerSec) * 10000000;
+    *out = MulDiv(latency, 10000000, This->fmt->nSamplesPerSec)
+         + This->period_ms * 10000;
 
     OSSpinLockUnlock(&This->lock);