user.exe16: fix a compiler warning on clang

[Austin English]

-- 
-Austin
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diff --git a/dlls/user.exe16/bidi.c b/dlls/user.exe16/bidi.c
index e415785..642aab2 100644
--- a/dlls/user.exe16/bidi.c
+++ b/dlls/user.exe16/bidi.c
@@ -64,7 +64,7 @@ DWORD WINAPI ChangeKeyboardCodePage16( UINT16 iLangLeft, UINT16 iLangRight )
  */
 DWORD WINAPI ChangeKeyboardLanguage16( UINT16 iLangLeft, UINT iLangRight )
 {
-    FIXME( "( %hu, %hu ): stub\n", iLangLeft, iLangRight );
+    FIXME( "( %hu, %u ): stub\n", iLangLeft, iLangRight );
     return 0;
 }