wintab32: fix compiler warnings on Clang

[Austin English]

-- 
-Austin
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diff --git a/dlls/wintab32/manager.c b/dlls/wintab32/manager.c
index f225d07..200fd3c 100644
--- a/dlls/wintab32/manager.c
+++ b/dlls/wintab32/manager.c
@@ -99,7 +99,7 @@ HCTX WINAPI WTMgrDefContext(HMGR hMgr, BOOL fSystem)
  */
 HCTX WINAPI WTMgrDefContextEx(HMGR hMgr, UINT wDevice, BOOL fSystem)
 {
-    FIXME("(%p, %hu, %hu): stub\n", hMgr, wDevice, fSystem);
+    FIXME("(%p, %u, %u): stub\n", hMgr, wDevice, fSystem);
 
     SetLastError(ERROR_CALL_NOT_IMPLEMENTED);