sched: clean up delta_mine

cleanup: delta_mine is an unsigned value.

no code impact:

   text    data     bss     dec     hex filename
   27823    2726      16   30565    7765 sched.o.before
   27823    2726      16   30565    7765 sched.o.after
Signed-off-by: NIngo Molnar <mingo@elte.hu>

kernel/sched_fair.c

@@ -283,8 +283,7 @@ add_wait_runtime(struct cfs_rq *cfs_rq, struct sched_entity *se, long delta)
 static inline void
 __update_curr(struct cfs_rq *cfs_rq, struct sched_entity *curr, u64 now)
 {
-	unsigned long delta, delta_exec, delta_fair;
-	long delta_mine;
+	unsigned long delta, delta_exec, delta_fair, delta_mine;
 	struct load_weight *lw = &cfs_rq->load;
 	unsigned long load = lw->weight;