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

While in the process of initialising a root domain, if function
cpupri_init() fails the memory allocated in cpudl_init() is not
reclaimed.

Adding a new goto target to cleanup the previous initialistion of
the root_domain's dl_bw structure reclaims said memory.

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/1485292295-21298-2-git-send-email-mathieu.poirier@linaro.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

kernel/sched/core.c

@@ -5979,9 +5979,11 @@ static int init_rootdomain(struct root_domain *rd)
 		goto free_rto_mask;
 
 	if (cpupri_init(&rd->cpupri) != 0)
-		goto free_rto_mask;
+		goto free_cpudl;
 	return 0;
 
+free_cpudl:
+	cpudl_cleanup(&rd->cpudl);
 free_rto_mask:
 	free_cpumask_var(rd->rto_mask);
 free_dlo_mask: