sched/core: Fix &rd->rto_mask memory leak

If function cpudl_init() fails the memory allocated for &rd->rto_mask
needs to be freed, something this patch is addressing.
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1485292295-21298-1-git-send-email-mathieu.poirier@linaro.orgSigned-off-by: Ingo Molnar <mingo@kernel.org>

kernel/sched/core.c

@@ -5976,7 +5976,7 @@ static int init_rootdomain(struct root_domain *rd)
 
 	init_dl_bw(&rd->dl_bw);
 	if (cpudl_init(&rd->cpudl) != 0)
-		goto free_dlo_mask;
+		goto free_rto_mask;
 
 	if (cpupri_init(&rd->cpupri) != 0)
 		goto free_rto_mask;