Fix an invalid memory access due to typo in win/cursor.cc.

BUG=crbug/391468
R=sergeyu@chromium.org

Review URL: https://webrtc-codereview.appspot.com/19949004

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@6698 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/modules/desktop_capture/win/cursor.cc b/modules/desktop_capture/win/cursor.cc
index 00055c4..e3c272c 100644
--- a/modules/desktop_capture/win/cursor.cc
+++ b/modules/desktop_capture/win/cursor.cc
@@ -197,7 +197,7 @@
 
     // The XOR mask becomes the color bitmap.
     memcpy(
-        image->data(), mask_plane + (width * height), image->stride() * width);
+        image->data(), mask_plane + (width * height), image->stride() * height);
   }
 
   // Reconstruct transparency from the mask if the color image does not has