wineoss.drv: Add period to latency calculation.

dlls/wineoss.drv/mmdevdrv.c

diff --git a/dlls/wineoss.drv/mmdevdrv.c b/dlls/wineoss.drv/mmdevdrv.c
index b46b60e..bb3297b 100644
--- a/dlls/wineoss.drv/mmdevdrv.c
+++ b/dlls/wineoss.drv/mmdevdrv.c
@@ -1055,6 +1055,10 @@
     }else
         *latency = 10000; /* OSS doesn't provide input latency */
 
+    /* pretend we process audio in Period chunks, so max latency includes
+     * the period time */
+    *latency += DefaultPeriod;
+
     LeaveCriticalSection(&This->lock);
 
     return S_OK;