[PATCH block/for-next] blkcg: add missing NULL check in ioc_cpd_alloc()

[Tejun Heo <tj@xxxxxxxxxx>]

ioc_cpd_alloc() forgot to check NULL return from kzalloc().  Add it.

Signed-off-by: Tejun Heo <tj@xxxxxxxxxx>
Reported-by: kbuild test robot <lkp@xxxxxxxxx>
---
 block/blk-iocost.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/block/blk-iocost.c b/block/blk-iocost.c
index 9c8046ac5925..2aae8ec391ef 100644
--- a/block/blk-iocost.c
+++ b/block/blk-iocost.c
@@ -1888,8 +1888,10 @@ static struct blkcg_policy_data *ioc_cpd_alloc(gfp_t gfp)
 	struct ioc_cgrp *iocc;
 
 	iocc = kzalloc(sizeof(struct ioc_cgrp), gfp);
-	iocc->dfl_weight = CGROUP_WEIGHT_DFL;
+	if (!iocc)
+		return NULL;
 
+	iocc->dfl_weight = CGROUP_WEIGHT_DFL;
 	return &iocc->cpd;
 }