mmdevapi: Fix stuttering upon start and underrun.

dlls/winealsa.drv/mmdevdrv.c

@@ -2107,7 +2107,8 @@ static HRESULT WINAPI AudioRenderClient_ReleaseBuffer(
                 alsa_wrap_buffer(This,
                         This->tmp_buffer + written * This->fmt->nBlockAlign,
                         written_frames - written);
-
+            else
+                This->lcl_offs_frames += written;
             This->held_frames = written_frames - written;
         }
     }

dlls/wineoss.drv/mmdevdrv.c

@@ -1740,7 +1740,8 @@ static HRESULT WINAPI AudioRenderClient_ReleaseBuffer(
             if(This->buf_state == LOCKED_WRAPPED)
                 oss_wrap_buffer(This, This->tmp_buffer + w_bytes,
                         written_frames - w_frames);
-
+            else
+                This->lcl_offs_frames += w_frames;
             This->held_frames = written_frames - w_frames;
         }
     }