um: fix os_timer_one_shot()

os_timer_one_shot() gets passed a value "unsigned long delta",
so must not have an "int ticks" as that actually ends up being
-1, and thus triggering a timer over and over again.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Richard Weinberger <richard@nod.at>

arch/um/os-Linux/time.c

@@ -113,7 +113,7 @@ long os_timer_remain(void* timer)
 	return its.it_value.tv_nsec;
 }
 
-int os_timer_one_shot(int ticks)
+int os_timer_one_shot(unsigned long ticks)
 {
 	struct itimerspec its;
 	unsigned long long nsec;