um: fix compilation error

Fix a compilation error due to a regression of commit d3c1cfcdb43e023ab1b1c7a555cd9e929026500a
"um: pass siginfo to guest process".

---
 arch/um/os-Linux/time.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

index f602385..0748fe0 100644
@@ -114,7 +114,7 @@ static void deliver_alarm(void)
 	skew += this_tick - last_tick;
 
 	while (skew >= one_tick) {
-		alarm_handler(SIGVTALRM, NULL);
+		alarm_handler(SIGVTALRM, NULL, NULL);
 		skew -= one_tick;
 	}
 

1.7.3.4

Thanks, patch will be submitted to Linus ASAP with other UML fixes.

Thanks,
//richard