timer: Use variable head instead of &work_list in __run_timers()

We already have a variable 'head' that points to '&work_list', and so
we should use that instead wherever possible.
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Cc: linaro-kernel@lists.linaro.org
Link: http://lkml.kernel.org/r/0d8645a6efc8360c4196c9797d59343abbfdcc5e.1395129136.git.viresh.kumar@linaro.orgSigned-off-by: Thomas Gleixner <tglx@linutronix.de>

kernel/timer.c

@@ -1192,7 +1192,7 @@ static inline void __run_timers(struct tvec_base *base)
 					!cascade(base, &base->tv4, INDEX(2)))
 			cascade(base, &base->tv5, INDEX(3));
 		++base->timer_jiffies;
-		list_replace_init(base->tv1.vec + index, &work_list);
+		list_replace_init(base->tv1.vec + index, head);
 		while (!list_empty(head)) {
 			void (*fn)(unsigned long);
 			unsigned long data;