64-bit cleanness: convert client requests to receive and return UWords.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@2921 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/helgrind/hg_main.c b/helgrind/hg_main.c
index 6e75bdb..aab4bf5 100644
--- a/helgrind/hg_main.c
+++ b/helgrind/hg_main.c
@@ -3233,7 +3233,7 @@
 /*--- Client requests                                              ---*/
 /*--------------------------------------------------------------------*/
 
-Bool SK_(handle_client_request)(ThreadId tid, UInt *args, UInt *ret)
+Bool SK_(handle_client_request)(ThreadId tid, UWord *args, UWord *ret)
 {
    if (!VG_IS_SKIN_USERREQ('H','G',args[0]))
       return False;