[IA64] sys32_signal() forgets to initialize ->sa_mask

Pointed out by Oleg Nesterov <oleg@tv-sign.ru>, who in turn
got the hint from Linus.

Signed-off-by: Tony Luck <tony.luck@intel.com>
diff --git a/arch/ia64/ia32/ia32_signal.c b/arch/ia64/ia32/ia32_signal.c
index 5856510..b3355a9 100644
--- a/arch/ia64/ia32/ia32_signal.c
+++ b/arch/ia64/ia32/ia32_signal.c
@@ -515,6 +515,7 @@
 
 	sigact_set_handler(&new_sa, handler, 0);
 	new_sa.sa.sa_flags = SA_ONESHOT | SA_NOMASK;
+	sigemptyset(&new_sa.sa.sa_mask);
 
 	ret = do_sigaction(sig, &new_sa, &old_sa);