winex11.drv: Report correctly when wintab is disabled

[John Klehm]

Tested with my uclogic WP5540 (thanks again Dan).  When plugged in
reported non zero for WTInfo(WTI_DEFSYSCTX, 0, &anyCtx) and when
unplugged reports zero.  This patch agrees with the Wintab spec
(report 0 when hardware absent).

Roderick Colenbrander reported issues with SDL code that tripped up
because of this issue.  This patch fixes the problem.

Regards,
--John Klehm
-------------- next part --------------
From 2771d018dd41869d482da55992edfa08542da446 Mon Sep 17 00:00:00 2001
From: John Klehm <xixsimplicityxix at gmail.com>
Date: Thu, 26 Nov 2009 00:16:03 -0600
Subject: winex11.drv: Report correctly when wintab is disabled

---
 dlls/winex11.drv/wintab.c |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/dlls/winex11.drv/wintab.c b/dlls/winex11.drv/wintab.c
index 30f3e85..c333539 100644
--- a/dlls/winex11.drv/wintab.c
+++ b/dlls/winex11.drv/wintab.c
@@ -1125,8 +1125,12 @@ UINT CDECL X11DRV_WTInfoW(UINT wCategory, UINT nIndex, LPVOID lpOutput)
             switch (nIndex)
             {
                 case 0:
-                    rc = CopyTabletData(lpOutput, &gSysContext,
-                            sizeof(LOGCONTEXTW));
+                    /* report 0 if wintab is disabled */
+                    if (0 == gNumCursors)
+                        rc = 0;
+                    else
+                        rc = CopyTabletData(lpOutput, &gSysContext,
+                                sizeof(LOGCONTEXTW));
                     break;
                 case CTX_NAME:
                     rc = CopyTabletData(lpOutput, gSysContext.lcName,
-- 
1.6.4.4